Develop a system for exchanging discount tokens for promo codes

It is necessary to develop a PHP system for exchanging discount tokens of the Binance Smart Chain network for industrial codes for a discount in Ecwid stores.

Tokens in BSC standard BEP20.

How the customer sees the solution:
1. Token exchange page with exchange instructions
2. The person on this page creates an order, sends an order and then tokens to the wallet specified on the page, a third-party service monitors that the tokens have been received on the wallet and sends a confirmation system via API
3. The system generates a discount promo code in the store (up to a maximum of 50% discount)
4. The system shows the promo code on the strip and duplicates the clients mail.

The system should be written in PHP and accompanied by the maximum number of instructions and explanations both in the code and in a separate document.

Equid API: https://developers.ecwid.com/ecwid-api
API Servicef monitoring wallet BSC: not yet found, but from definitely exists.