Writing code to interact with the WEB server through API requests

There is a GPS tracking server - Wialon. I want to create my own application for biling, I plan to use API requests, Wialon API documentation Available
https://sdk.wialon.com/wiki/ru/sidebar/remoteapi/r...
The difficulty for me is that? that I previously used ActivX in conjunction with VBA. I have no programming experience in Java. But I have experience in programming on the B4X platform (BASIC for Android).
https://www.b4x.com
I have already created mobile applications using B4X, with access to a SQL server, but I do not understand the api query technology well. I will give preference to a person who will help me to write a sample code using B4X, how to receive and process information from Wialons server via API.
Preference will be given to a specialist who will not insist on using a technology familiar to him (Programming language) in my wish you can solve the problem with the help of B4X, the trouble is that I have little knowledge and the B4X forum is rich in specialists but all expats.