Develop a module for integration with the payment system

Task
To develop a module for the integration of the site with the payment system.


Requirements
The module must accept the following requests:

Create Payment - a request to receive a unique payment identifier.
The module must accept a REST API POST request with payment details (payment amount, payment currency, desired language, etc.), request a unique transaction ID from Processing and return it in response to the request. Get Payment Status - a request for payment status.
The module must accept a REST API POST request with the payment ID, request the payment status from the Processing and return it to the status and additional information about the paymentClose Business Day - request to close the business day.
The module must accept a REST API POST request without parameters, send a command to close the working day to the Processing Center and return the result.
Requests to the Processing Center must be signed with the Store certificate.

To contact the Processing Center, the module must use the TLSv1.2 protocol.

The module must be deployed and configured on the Customers infrastructure.

The contractor will be provided with examples of the implementation of information interaction with the payment system in PHP.