How can I change the deal column in CRM using the Bitrix24 API?

Question

Bitrix24

In fact, I need to process the supplier's response from the viber, for example, to the question: "Is the product in stock?". If there is, we send the order to the "In stock" column, otherwise to the "Out of stock" column. It needs to be implemented using PHP.

Answer 1

Basically, you asked a few questions:
1) How to read the answer from Viber
2) How to understand which deal this answer refers to (if it refers to a deal)
3) How to change the stage of a deal
Answering your question "How to change the stage deals", you can use the rest-method crm.deal.update (for the cloud) or CCrmDeal::update (see similarly for the lead https://dev.1c-bitrix.ru/api_help/crm/example.php)