Build API Integrations With NodeJS Using AWS Lambda Functions for 5 Sets of APIs

=== PLEASE START ALL APPLICATIONS WITH "Have Browsed API Documentations" === Briefly, this project connects a react frontend with a backendless (database-as-a-service) database via APIs. It also connects the react frontend with a few other services, also via well-documented APIs. I'm looking for a nodeJS developer to build simple AWS Lambda functions as the API connectors. Each Lambda function will be connected to a API Gateway to listen for webhooks. Only methods in the Lambda functions need to be coded – connecting it to the API gateway etc I will handle. It is an ongoing project with new features to be added week on week. I have basic coding background, and will be able to articulate the technical requirements quite well. The "most difficult" part of this project will probably be reading and understanding 5 sets of API documentations – which generally shouldn't be too hard for any decent developer. I am looking for someone who preferably has expertise integrating some/all of the following APIs: (1) Shopify API (See REST Reference, ignore Storefront API and Partner API) – [login to view URL] – Use Inventory API to pull and push quantity numbers – Use Order API to pull orders from store (read only) – Use Shopify Payments > Transactions API to match payment processor fee with orders (2) Xero Accounting API – [login to view URL] • Create a quotation, invoice and credit note (all line item details will be passed as an array of objects payload) to the triggering webhook (3) Backendless Database API (ignore other APIs) – [login to view URL] • Query database with a Where clause ([login to view URL]), search with SubQuery ([login to view URL]), and other general query operations • Perform grouped CRUD operations via API calls – i.e. all operations succeed or fail together ([login to view URL]) (4) MessageBird API for WhatsApp – [login to view URL] • The idea is to mirror the MessageBird data on our Backendless Database • Use the API to check for existing MessageBird webhook to trigger on new WhatsApp messages, and if no webhooks exist, to create it • For each new Whatsapp message that the MessageBird webhook receives, to in turn trigger a API gateway wehbook with the message as payload. The Lambda function attached to this API gateway webhook then creates a new record in Backendless database. • Create a Lambda function to POST to MessageBird API, to send a WhatsApp message (5) EasyShip API – [login to view URL] • Create a shipment (includes selecting lowest rate first) • Retrieve, Update, Delete shipments • Create a courier pick up Please take a look at the API documentations, and let me know after reading through if you are interested in this project.