Integration with the vendors site by its API

There is an empty online store on 1C Beatrix, which must be filled with http://new.mirprovodov.ru. Heres the information from the goods supplier:
Our B2B portal https://b2b.el-com.ru have the opportunity to work through the API: to receive catalog, images, characteristics, certificates, balances and prices. All of this can be done with the API. Heres the connection documentation - https://b2bmotion.docs.apiary.io/#reference. Contact the API at https://b2b.el-com.ru/api/v1/. To authorize, you need to use the title design of Authorization q "Bearer 6w0K-FpV2VxjJgmUCJ90uB5krIp0KtF". API memo: https://www.el-com.ru/upload/pdf/API08122020.pdf
You need to unload goods from the supplier and need to update permanently at balances and prices.