Magento 2 API Module

Development of Magento 2 module with the following functionality: 1. In Magento Backend, System->configuration, there will be a setting for the module to work on either: a) schedule (cron job recurrence can be pre-set in the xml file) b) real time - this will trigger API call on the product page to check stock availability with the supplier. 2. In both cases after an order is placed an information needs to be sent to relevant system to decrease the stock (if applicable) 3. Magento customer profile (who also can be a seller) needs to be extended to handle product feed information: a) Feed format with values "XML,CSV,API,DATABASE" b) for all of the above the required field is Feed address/url c) Optionally user can set username and password d) For database user can set database name 4. When working with scheduled mode, the extension would go through each product, check via supplier account if any feed is provided, and check/update stock accordingly 5. When working in live mode, the extension would do the check only on the product page 6. The extension must work through connection and parser classes which will be extendable with more connection types and more formats - It will receive connection type and parameters and product SKU - it will return stock - for multiple products within the same supplier it will receive array of SKU's - it will return associative array SKU=>Quantity 7. Extension will also maintain log file for updates performed, optionally it will always send summary email with changes performed. Email field needs to be provided in the backend.