How to integrate the site (SOAP/HTTPS) with the credit system?

Question

JavaScript

Good day to all!
I just started to understand, I don’t understand much about this issue.
There is our website (not an online store) on the platformalp site, SSL is connected to the domain.
There is a pos-credit lending system
There is integration documentation:
https://api.b2pos.ru/shop/manual/
I connected a script in the head to initialize the call of methods
I connected the accessID given to me
Then I don’t understand what to do
Question: How to integrate the site with the system lending?
Just write down the points in which direction to move, what needs to be done.
PS If the answer to the question is too voluminous, and you do not want to answer it,
something that write at least something to study, in order to ultimately integrate

Answer 1

Babel uses es6(ESMASCRIPT 2015) syntax, which is not supported in your project.

Answer 2

1. hire an integration specialist