Whatsapp app send bulk contact message jobs

Good I am making a script for a client in python, where I am building a program where the program will generate me 100 weekly emails at most, these emails must have a phone number associated with each of them a number, ie emails have to be valid, the customer wants to receive and send mails, I am looking for creation of server to receive and send mails with emails created by the python app. emails are created randomly and just like passwords with a custom domain. I speak a little English so if you know Spanish we would understand each other better.

...audience.. - Ensure the video is suitable and safe for internet posting, particularly on YouTube. Qualified individuals should show a strong portfolio in videography and editing. Prior experience in creating child-oriented content is a bonus. Link to we transfer video I will transfer song via WhatsApp...

We don't want our employees to see the phone numbers of customers on whatsapp and chat with them. We just want to restrict whatsapp usage to making calls only without visibility of the numbers. So best is that if the GUI of WhatsApp Desktop is not visible and we access it using another app. Either from browser or another windows app. Alternative is that we do this with android app

Don't show the whatsapp app or atleast hide the numbers and don't allow users to access chats. Only allow whatsapp calls with no number visibility and settings change. The goal is to allow users to make whatsapp calls only to the saved contacts only. So can you modify whatsapp or run in hidden mode to use it using another app.

...displaying travel routes. - **Basic Admin Panel:** - Set up Django Admin for basic data management. 2. **Iteration 2: GPS Tracking & Advanced Sharing** - **Live GPS Tracking:** - Implement live GPS tracking functionality for a trip, allowing users to share real-time location updates with family and friends. - **Sharing Channels:** - Allow users to share diary entries via WhatsApp link, RSS, social media, ActivityPub, and email. - **Media Management:** - Implement media management for photos associated with trips. 3. **Iteration 3: Discover & Review** - **Discover Travels:** - Enable users to discover trips shared by others and use them as inspiration for their own journeys. - **Accommodation Reviews:** - Allow users to doc...

I'm seeking a skilled professional who has a well-rounded understanding and proficiency in managing both social and enterprise communication platforms - WhatsApp and LinkedIn. maintaining my website's content by updating with regular news updates. Another key responsibility would be creating and designing creative posts for engaging online content. Key responsibility , setting up backups and restoring information Ideal Skills and Experience: - Proven social media management skills, especially handling WhatsApp and LinkedIn. - Ability to adapt and respond to different types of content and conversations. - Experience with website content management, familiar with timely updating news sections. - Ability to create visually engaging, innovative, and creative medi...

I'm in need of a well-designed PowerPoint presentation tailored for a series of brand marketing mee...series of brand marketing meetings. The main goal of these meetings is generating sales leads, with our focus on potential B2B clients. The presentation should be: - Professional and formal in tone, aligning with our business-to-business approach. - Infused with engaging elements without losing the overall professional appeal. - Informative and straightforward, clearly communicating our brand message and any product information in a succinct manner. Skills in brand marketing, PowerPoint design, and B2B communication will be essential for this project. I'm looking for an experienced freelancer who can deliver a sales-oriented presentation that can captivate the attention o...

I'm seeking a skilled graphic designer to create a modern logo for my stair manufacturing business. The color scheme is flexible as I did not preselect any specific colors. The logo style should reflect a modern aesthetic. It could incorporate text, image, or a fusion of both, as I'm open to any format that effectively gets the message across. Ideal candidates for this job would have experience in graphic design, specifically with creating logos for manufacturing or related industries. Your portfolio showcasing similar past work will positively influence my decision. Please provide a brief explanation of your design process along with your bid. Our Current Website can be reviewed at We have been trading as American Woodcrafters for the past 30 years, but are rebranding

I am looking for a web developer to join my digital marketing agency. This will be a ongoing job, you will receive 2-5 projects per week. We pay $25-$50 per project depending on complexity. Good English is a must and you must be able to work with the rest of my team during EST time. Your job will include the following: - Add template to wordpress/shopify - Add banners that are created...WordPress and Shopify development - Strong understanding of e-commerce functionalities - Proficiency in HTML, CSS, and JavaScript - Familiarity with SEO best practices - Excellent communication and problem-solving skills This is a great opportunity for an individual with a diverse skill set in web development. Please put SAmit in the email so I know that you are not a bot and actually read the me...

I own a small IT company that builds web and mobile apps. I need to have contract templated drafted which I can use in our fixed-scope, fixed-price projects. I want a well-written, easy-to-understand, well-structured and organized document. I previously attempted to have this prepare...- Writing style should take in account this is not a legal document only but is a business document. It should be prevented the reader to have negative thoughts about the processes and clauses of the document. If you think you are a lawyer with writing skills, please apply by submitting sample work demonstrating your writing skills. Also please put "I can write" at the begining of your bid message, so I know you have actually read this. (Spamming accounts who has not read the descriptio...

I'm establishing a personal website that's designed to retrieve a specific message from my Hotmail email account and display it. In the context of this, the "specific message" is a temporary code. Here's a brief insight into what I'm envisioning: - Email Targeting: The website should allow for the selection of any Hotmail email address. The purpose of this is to ensure that the site can pull messages from different accounts as needed. - Specific Message Retrieval: The core functionality will be to retrieve and display a specific message from the selected email account. That message is usually a temporary code from netflix. - Search Function: A search bar is necessary for sifting through emails quickly. - Auto-Refresh: I...

I am in need of a Discord self-bot that's capable of responding with tap on reaction of famous bot karuta message and also reacting on it more details in dm - Implementing image reactions: The bot must recognize and respond to specific user commands with pre-defined custom images. Skills and Experience: - High-level understanding of bot creation and functionality in Discord. - Proficiency in using API for creating reactions. - Experience designing and implementing custom functions in Discord.

I have a website currently on th...scalability, and customization options compared to Catchypages. 3. Basic App Development: - Creation of a basic app that can be used With gps trackers with a customised button for users to send sos message alert - The app should be user-friendly and integrated with the website and tracking software. Skills and Experience: - Proficiency in website optimization and migration, especially from Catchypages to a new platform. - Experience in basic app development, focusing on tracking and messaging functionalities. - Familiarity with Cloudflare and other recommended platforms for hosting the website. - Strong communication skills to ensure a smooth transition and clear understanding of project requirements. ...

I'm in need of a graphic designer specialized in banner design. The purpose of this project is to deliver information and communicate a message through a banner that will be used as a poster. Here are the guidelines for the project: - Interpretation of the message is crucial. The design should effectively communicate the intended message, acting as an informational poster. Ideal Skills & Experience: - Extensive experience with graphic design. - Proven track record in banner design specifically. - Outstanding visual communication skills. Freelancers who can deliver a draft design within a short time frame would be highly valued.

I need a professionally designed logo that combines text and symbol elements to represent my food brand. Key Requirements: - The logo should ideally combine the essence of professionalism with a touch of approachability - The focus should b...with a touch of approachability - The focus should be on branding my food business in a visually appealing way - I need this project completed as soon as possible - Logo should be simple and easy so that people can remember it Ideal Skills: - Proven experience in designing combination logos - Understanding of branding and visual communication - Ability to create a logo that conveys a specific message or feeling - Attention to detail and creativity to make the logo appealing yet professional - Timeliness in executing the task as I have a tigh...

Hi! I am seeking an expert in Google Cloud's Pub/Sub service. My Python application needs to publish and subscribe to text data messages. Knowledge in message encoding and decoding, as well as Pub/Sub client libraries, is crucial. Therefore, a strong background in Python and Google Cloud Platform is required. Take a look a example image attached. Key responsibilities include: - Assisting with publishing text data messages - Helping with subscribing to these messages Please have proven experience in Google Cloud's Pub/Sub and Python programming for processing text data.

I'm in need of a bulk email sender to help with my email marketing campaigns. The main goal of this tool will be to effectively reach and engage my audience through email. Key Project Details: - The main goal of this tool will be to effectively reach and engage my audience through email, primarily for marketing campaigns. - I require this tool to integrate seamlessly with my current CRM software, enabling me to access and manage my contact lists with ease. - The ability to import email lists from a file is highly desired. - While I haven't specified a preference for list management, I'm open to suggestions and best practices. - It's important that the tool is user-friendly and provides insight into the performance of my campaigns. Ideal Freelancer: - ...

I need a professional to implem...Increase the number of members of our associated Facebook group - Increase the number of members of our associated Whatsapp channel - Increasing the website's visibility in Google (e.g. through high DR backlinks or similar) It is important that only permitted and legal methods are used to increase the number of German-speaking participants! Backlinks only from real websites with traffic! No link farms or blackhat sites! I expect a precise structure in the procedure with concrete suggestions for action for the planned implementation, already in your offers. A 100% legal implementation is important to me, without running the risk of Google and/or Meta (Facebook & Whatsapp) blocking access! Please only bid if you really have exper...

Need someone that can build a intake real estate webiste for me. It could be a simple website that has places that people can submit their real estate information, also has place they can upload files/ photos. Once someone submit their real estate information, the website needs to send me a email for all the real estate details. Message me "LandSale" first, if you are interested.

I am seeking a talented developer to create a bulk phone number checker that is compatible with Whatssap. The core purpose of this tool will be to check if the numbers on my list are active on Whatssap. The end goal is to utilize these numbers for promoting my business. Key Features: - Bulk Phone Number Verification: The tool should be able to check multiple phone numbers at once. It should separate the active numbers from the inactive ones. - Whatssap Compatibility: The tool needs to connect with Whatssap API to confirm the activity of the numbers. Delivery: - Data Export: I require the verified numbers to be exported to an Excel spreadsheet for easy access and use or .txt file Skills & Experience: - Proven experience in API integration, specifically with Whatssap....

I need an expert form designer to build a custom form on Tally. It is vital that the form mimics the design shown in an attached image. This form will be embedded on different areas of my website specifically, the Contact page () and Service page (like this one: ) Key elements of the form include: - 5 fields - Fields: Name, Email, Phone number, Company name, and 'Your message' field for users to fill in. - A field to address the user either as Mr. or Miss. For this job, you should have: - Significant experience in form designs, particularly in Tally - Proven expertise in integrating Tally forms on websites - Attention to detail as the form should look exactly like the designated

...objective is to encourage these clients to settle their pending payments. Key Requirements: - Regular Email Follow-Ups: I'm looking for someone who can send emails to this group of clients five times a day for a duration of 30 days. - Effective Communication: Your emails should be professional, engaging, and persuasive, aiming to prompt clients to take action and clear their dues. - Results-Driven: The success of this initial project will determine future collaborations. If these emails result in clients making payments, you'll be offered further work and regular pay for follow-up work, potentially extending to other communication channels like WhatsApp. The ideal candidate should have: - Prior experience in email marketing and specifically in sending effect...

...integrate the system with various platforms. Specific platforms such as Salesforce, Mailchimp, and Shopify should be considered. - AI Chatbot Implementation: While the details of the AI chatbot features were not specified, the Go High Level expert will be in charge of incorporating it on Instagram and WhatsApp. - Automated Client Follow-ups: The individual will be responsible for setting up automated client follow-ups. This will be achieved through Email Marketing, In-app messages, Instagram, and WhatsApp. The ideal candidate should be well-versed in Go High Level, and have a strong background in sales funnel management. Furthermore, a keen understanding of CRM systems and chatbot technology is necessary. Experience in system integrations with Salesforce, Mailchimp...

...webRTC expert and Odoo expert to give us guide and assistance of how to integrate our AI model into the Odoo 16 webRTC. We have already build the AI model, the webservice and endpoint to commnicate with it and everything related to the AI. So far we have a module that connects with our AI server, everytime an odoo channel is created it reviews the messages, sends it to the AI and creates a new message in the channel that acts as a reply Tasks include: - Customizing Odoo to fit our specific needs - Integrating webRTC within our operations - Troubleshooting and resolving any related bugs Once your tasks are completed, there will be minimal involvement required, you'll just ensure that the project is off to a good start. For this gig, proven experience with Odoo and webRTC ...

...understanding of VoIP technology. Knowledge of Issabela or similar software is an added advantage. Let's connect if you can guarantee a seamless and efficient communication system. For more information, sent the requerimients - The calls received would be answered by several receptionists who would log in/unlog in with their landline to receive the call. If there are more calls than receptionists, a message will appear indicating that they will assist you immediately. - The receptionists would route the calls to the agents available at that moment, who in turn would log in/unlog in with their landline to answer the calls. - For receptionists there would be a real-time panel of incoming and active calls, as well as receptionists and advisors logged in, free and busy on calls....

...Key Requirements: - Incorporating compelling motion graphics: Your main task will be adding visually appealing and educational motion graphics to my video. This includes ensuring the graphics are both engaging and informative. - Understanding educational content: As the primary goal of the video is educational, you will need to understand the content and ensure the motion graphics align with the message being conveyed. Ideal Skills: - Proficiency in After Effects: You should have extensive experience with After Effects and be able to create high-quality motion graphics. - Ability to understand educational content: It's important that you are able to grasp and represent the educational content in a visually stimulating way. Prior experience with creating educational video...

I am seeking an expert in Google Cloud's Pub/Sub service. My Python application needs to publish and subscribe to text data messages. Knowledge in message encoding and decoding, as well as Pub/Sub client libraries, is crucial. Therefore, a strong background in Python and Google Cloud Platform is required. Take a look a example image attached. Key responsibilities include: - Assisting with publishing text data messages - Helping with subscribing to these messages Please have proven experience in Google Cloud's Pub/Sub and Python programming for processing text data.

...viewing), and can be used for future campaigns. Requirements: Fluency in both Arabic and English is required for this project. Proven experience in graphic design, specifically brochure design Portfolio showcasing previous brochure design projects Proficiency in graphic design software (e.g., Adobe Illustrator, InDesign, Photoshop) Ability to understand and effectively communicate the brand's message through design Attention to detail and ability to deliver high-quality work within deadlines Deliverables: Initial concepts and drafts for review Finalized print-ready and digital versions of the brochure Source files and any additional formats requested Budget: 50 USD Timeline: We would ideally like to have the brochure completed within a day. Please let us know your avail...

This project aims to build an informative and precise contact list for our business use. We will provide you with a list of 1000 records, and your job will be to Google each one and fill the respective information - Website, Address, City, State, Zip, Phone - into a shared Google Spreadsheet. The focus of this data collection will be on the specific records we supply. Ideal skills and experience for the job: - Strong web research skills - Prior experience in data entry - Attention to detail and accuracy - Proficiency in Google Sheets - Ability to meet deadlines.

I'm seeking a creative and professional graphic designer to create a new logo for my mentoring group called "Titus 2:6". The main concept we want to convey is the transition of Godly wisdom to the next generation. The envisioned logo features a "T" shaped like a cross, representing the bible, with "2:6" following it. This will symbolize our group's commitment to wise mentorsh..."T" shaped like a cross, representing the bible, with "2:6" following it. This will symbolize our group's commitment to wise mentorship. Skills and Experience Required: - Proficiency in typography-based design - Experience in using symbolic representations - An understanding or interest in Christian imagery would be advantageous - Must be able to fait...

As a WordPress developer, I'm looking for someone to build a website for our textile products meant for the hospitality industry. The main aim of this project is to create a website where...build a website for our textile products meant for the hospitality industry. The main aim of this project is to create a website where we could list our products to generate enquiries from potential clients. The website should have a user-friendly contact form that specifically collects the user's name and email, along with their message. Ideal skills and experiences for this job include: - Strong proficiency in WordPress and its plugins - Prior experience in developing product listing websites - Expertise in developing user-friendly contact forms - Knowledge of the ho...

I'm in need of a few high-quality stock videos for an upcoming advertising campaign. Key Requirements: - The videos should be in Full HD (1080p) quality, suitable for advertising purposes. - Each video should be less than 1 minute long, to maintain viewer interest and engagement. Please note that I'll provide the necessary details and context. Looking for someone skilled in video selectio...campaign. Key Requirements: - The videos should be in Full HD (1080p) quality, suitable for advertising purposes. - Each video should be less than 1 minute long, to maintain viewer interest and engagement. Please note that I'll provide the necessary details and context. Looking for someone skilled in video selection and editing to help ensure the selected videos match the campaign&#...

I'm looking for a skilled freelancer to create a PowerPoint presentation with an innovative and creative tone. The main goal of this presentation is t...innovative and creative tone. The main goal of this presentation is to engage potential customers in a compelling way, so they feel excited about the content and the business it represents. Key Requirements: - Experience in creating marketing presentations, particularly for engaging potential clients - Proficiency with PowerPoint, including advanced design and animation features - Ability to convey a message in an innovative and creative tone - Creative data representation -create an editable version of the presentation (We need to update the numbers later) Skills: PowerPoint, Marketing, Creative Content Development, Audie...

I'm looking for an experienced SEO professional who can help me address some admin issues with my existing website. I need to clean up some back-end issues and resolve some admin tasks to improve SEO. Key Tasks: - Fixing broken links: The website has a number of broken links that need to be identified and rectif...that could be harming the website's SEO. The ideal candidate for this project will have good references and is able to work in our custom CMS system this is not Wordpress. If you are confident in your SEO skills and can help me address these issues, I would love to hear from you. Please get in touch as soon as possible. I am happy to pay a block of 5 hours work and then re-assess. Please message me if interested to receive a site link to assess if this wor...

I need an experienced Wordpress developer who has handled Elementor critical errors before. My problem is accessing and making changes to the homepage of my website through Wordpress. Whenever I try to edit it, I get a critical error message. Key Responsibilities: - Diagnose the cause of the critical error message - Fix the issue, allowing for normal operation - Ensure the homepage is editable again - Provide guidance on avoiding such issues in the future Ideal Skills and Experience: - Proven expertise in Wordpress and Elementor - Experience in handling critical errors - Strong ability to troubleshoot and problem-solve - Good communication skills to explain the issue and its resolution.

Need to create bot with the help of different API(I give you) that would make his LLM suit for Hebrew language. Integration of the bot to website/WhatsApp/telephony and Instagram. The one to success with the project will be rewarded not only financially but also with other perspective projects.

...model into the Odoo 16 webRTC. We have already build the AI model, the webservice and endpoint to commnicate with it and everything related to the AI. So far we have a module that connects with our AI server, everytime an odoo channel is created it reviews the messages, sends it to the AI and creates a new message in the channel that acts as a reply To achieve this we follow the next structure: 1) redefine create on 2) send message body to IA 3) get message and post a message on the channel So far this works on internal chats, but we want this to work on live chat sessions, the idea behind this is that the clients communicate with the IA With the current code we have several issues: 1) a client should no be able to write in the live chat until h...

i am looking out for SMTP and Technology expert who can help build an email verification platform like “MillionVerifier '’ and “Neverbounce” "listclean". 1. **Validate Email Addresses:** The platform should be able to cross check every submitted email address and validate them to confirm legitimacy. 2. **Spam Check:** There must be a provision to check and detect spam emails and effectively filter them out. 3. **Remove Invalid Emails:** The system should have the ability to remove invalid email addresses from any uploaded list or one-by-one input. 4. Hard Bounce. 6. Invalid Syntax 7. Toxic Domain 8. Abuse Email 9: API 10: Including All features site Accuracy is extremely vital to this project and the system is expected to give a high accura...

I'm looking for a skilled designer to create a vibrant and engaging visual identity for my company 'squadgames'. We specialize in running wheelchair basketball sessions for corporations as team building days. The design should be fun and energetic, reflecting the lively and inclusive nature of our sessions. We have alread...branding and design - A portfolio that showcases your ability to create diverse and engaging designs - Familiarity with the sports or team-building sector is a plus - Strong understanding of corporate branding needs This project is a great opportunity for you to showcase your creativity and design skills while contributing to a meaningful cause. Looking forward to receiving your proposals! Send me a message if you're interested and hav...

I need an experienced research specialist to collect, verify, and authenticate phone numbers, email addresses, and physical addresses for more than 100 companies. The task involves: - Accurately identifying relevant contacts - Verifying the accuracy of the gathered contact information - Ensuring the contact information is up-to-date Required Skills & Experience: - Proven experience in online research and data verification - Familiarity with manufacturing sector companies is a plus - Attention to detail and a high degree of accuracy - Excellent communication skills.

Description: We are seeking a proficient individual or team to create a data collection tool to capture crucial information for our programs. The project involves gathering data related to attendance, classroom IDs, session IDs, and artifacts (pictures of classrooms as evidence) from WhatsApp/SMS communication channels. Project Scope: The primary data points to be collected include: Attendance records of students attending weekly sessions. Classroom IDs where sessions take place. Session IDs for each session conducted. Artifacts: Pictures of classrooms as evidence of session conduct. Schools & Instructors: Our program spans across 100 schools with 37 instructors and 13,000+ students Each instructor is responsible for conducting weekly sessions twice a week. Instructors are ...

...Engineering Consultant" stands as a distinguished name in the engineering consulting realm. We are dedicated to delivering innovative solutions and top-notch services across diverse projects. Our commitment to excellence and client satisfaction distinguishes us in the industry. Design Requirements: The profile should encompass vital details, including: Company name and logo Contact numbers, email, and website A warm welcome message from our office manager An "About Us" section elucidating our company's mission, vision, and objectives Compelling images showcasing our projects A summary of our certifications and accolades Information highlighting our esteemed team members The profile should consist of no fewer than 15 pages. Preferably, the profile shou...

We are looking for a free...consistent across all articles. - Communicating progress updates regularly via WhatsApp. Requirements: - Native Polish speaker with impeccable language skills. - Proven experience in proofreading, preferably with content related to health or maternity. - Ability to work efficiently under tight deadlines—completion required within 10 days. - Must be able to work online using a straightforward web interface; no software installation necessary. - Please note: AI proofreading tools are not to be used for this project. Budget: We have a fixed budget for this project, so please include your total fee for the entire batch of articles in your proposal. If you are interested and meet the above requirements, please send your proposal. We look forward...

I am looking for a German translator with experience in general translation to convert audio recordings into German text. Key Requirements: - Translate audio recordings accurately into German - Ensure the translated content is faithful to the original message and context - Understand and apply the nuances of the German language - Meet the project deadline Ideal Candidate: - Proficient in German and English - Prior experience in general translation - Experience with audio translation is a plus - Excellent attention to detail and accuracy - Ability to meet deadlines

I am in need of a proficient Wordpress specialist to fine-tune the intricacies of my website's homepage. Here's what requires attention: Tasks: 1 Add New Widget: The centerpiece of this project involves the addition of a specific new widget - a plugin accommodating Google comment...intricacies of my website's homepage. Here's what requires attention: Tasks: 1 Add New Widget: The centerpiece of this project involves the addition of a specific new widget - a plugin accommodating Google comments. Your skill at seamlessly integrating this into my sidebar is crucial. 2 Modify existing Widget: Remove the 4 picturebox and add simply Picture i dont want agressive hiring no whatsapp no email no calls ! just use freelancer.com for offer your Knowledge Site UR...

...help me resolve an Apache ModSec error that is preventing a specific theme inside WordPress from working properly. Key Requirements: - The problem I'm encountering is related to ModSec, and is preventing the theme from functioning as expected. As such, the freelancer should have a good understanding of ModSec and Apache, with a specific focus on troubleshooting and fixing errors. - The error message is not provided here, but the last change I made to the website was modifying server or ModSec settings. The freelancer should be able to work with me to understand the changes made and identify the cause of the error. Expectations: - I am specifically looking for someone who can troubleshoot and fix the ModSec error, rather than just disabling ModSec for the specific theme. T...

A Dating WEBSITE Not an AP - YOU Must Send a link to an ACTIVE Dating Site You Built OR DO NOT RESPOND More details: Is this project for business or personal use? For starting a new enterprise What information should successful freelancers include in their application? YOU Must Send a link to an ACTIVE Dating Web Site You Built OR DO NOT RESPOND How soon do you need your project completed? Within a month

I need a basic video maker to create engaging tutorial videos targeted at the general public, with content primarily for beginners. These videos should be simple to understand, interesting, and visually appealing. Key Responsibilities: - putting information in a given template - will need bulk content (60 short 2-3mins videos in ppt form) in 7 days - i'll provide all the required information and materials and teach you how to do what. each video will hardly take 5-10 mins to edit and make. all should be done on canvacanva pro. - basically a presentation, that's it. - Incorporating engaging visuals and graphics sometimes in a few slides to ensure information retention - add extra graphicvisuals wherever needed - need to make videos Ideal Skills and Experience: - just h...

Requirement of Website development (mobile responsive) which will generate the QR codes and on scanning should provide appropriate action list as defined in system. Below are the list of modules required 1. Admin 2. Customer 3. Vendor 4. Random user Few more requirement as below 1. Dashboard for admin 2. Reports for admin and vendor 15 nos 3rd party integrations 1. SMS/whatsapp 2. Email 3. Calling service like Uber 4. Payment gateway Features in modules 1. Admin * Login. Option to create new ids * Dashboard * Setting up price for the product. * Tax module * User Access Module * To create new users for admin * To create new vendor users * Reports * Delivery status of product * Qr generator * QR printer * Handling o...

Want whatsapp chatbot for business use