Integration of the companys management system with the payment API (knowledge of English or French is required)

The project binds the payment API and TMS. A company in France wants to accept payment from customers by bank cards so that projects within their project management system change their status to paid ones.

- Project Manager (user) generates a unique payment link through our interface
- the client follows the link to the companys website and gets to the payment page from the French payment system
- after payment, the status of the project (paid) within the companys project management system should be updated. It has a basic REST API.

I am looking for a person who can offer a solution and calmly make the integration and answer the customers questions in English. Ill send the API.