How to understand the description of sending a request via api?

Question

API

The interaction of the parties is based on xml through the HTTPS protocol, the login and password given to you when connecting are used to authenticate the client. For authorization, the Json Web Token received after authentication is used.
Test URL: https://accountsapitest.easypay.ua:3322
Battle URL: https://accountsapi.easypay.ua:3322
Swagger(test) - https://accountsapitest.easypay.ua:3322/swagger/in..
Possible HTTP statuses: 200
- Successfully processed the request;
400 - Invalid input parameters;
403 - Invalid login, password or token;
500 - Request processing error, please try again later or contact support.
Help me understand, is there a structure of the requests themselves, how to send them correctly and get a response?