Creating a Wordpress plugin

Hello, I need a Wordpress plugin integrated with a digital payment platform (similar to PayPal) and made in PHP. The API is complete but I only need the credit card sales function on a recurring basis. They are called Rest API. The plugin for the user will be a transparent checkout. You will have all the technical support and a Sandbox environment for testing. The API is published at [login to view URL] Here is an example of a call (invalid Authorization): curl -X POST \ [login to view URL] \ -H 'Content-Type: application/x-www-form-urlencoded' \ -H 'Authorization: Basic Kddreeam1pZ0xHZTpnZTJSJWd0N94MmWFI+ZjhHOmRwgffLVlPbH5kOWpQfs==' \ -d 'grant_type=client_credentials' The first step is authorization [login to view URL] In case of transparent checkout by credit card: - You will generate the charge using the data collected at your checkout, through POST / charges [login to view URL] - POST / cartoons will return a chargeId to you - The card data, you will report to the encryption library, which will generate the creditCardHash [login to view URL] - With chargeID and creditCardHash, you will pay these charges through POST / payments [login to view URL] We need a simple PHP page to generate a license as a hash code or similar that includes the domain where the plugin will be installed and an expiration date (yyymmdd). Each access this license will be checked. The plugin will display a configuration page where the necessary data will be presented: "clientId", "secret", call URL (radio button for Sandbox or production), array of services / price / number of parcels, destination URL after notification payment, domain, license .... The plugin will go through an approval before being approved. This plugin will be marketed to third parties and we can align a partnership for maintenance and commissioning. We take care of sales and technical support. The source code will be delivered. The plugin in Wordpress installable format will also be delivered. An experienced PHP programmer can do this job in less than 6 hours. After closing we will send you a more detailed definition. But the essentials are already described here. The source code will be delivered. The plugin in Wordpress installable format will also be delivered. If your budget is a little higher than the one proposed, please inform me. Thank you.