If you disconnect a chat channel, you will see an error message Lead source disabled.

Headers & Authorization type

Parameter	Data type	Description
Date	string	Date and time when the request was generated. The signature will be valid for 15 minutes from this Date. The date should be in the format “Thu, 01 Jan 2023 12:00:00 +0000” (RFC2822)
Content-type	string	Request data type. Currently, only `application/json` is supported.
Content-MD5	string	For the request body, it is necessary to calculate the MD5 hash and indicate it in the header in lowercase. At the same time, it is important to keep in mind that the request body is calculated as a stream of bytes without considering the end of JSON markup, and if there are `\n` or spaces at the end, they will also be taken into account. For GET requests, MD5 must also be calculated. Even if nothing is passed in the request body, MD5 will be obtained from an empty string.
X-Signature	string	Signature of the request as a string. It is formed from the name of the method (GET/POST) in uppercase, with the values of the headers concatenated by `\n`. Header values come in a specific order. If there is no header, an empty string is specified instead. Next, add the requested path from the URL without the protocol and domain (without GET parameters) to the line. The resulting string is calculated using HMAC-SHA1, and as a secret, we use the channel secret obtained during registration. The resulting hash in lowercase is indicated in the X-Signature header.

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Calculate headers for Chats API requests

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Data type header when the request is successful/in case of an error
Content-Type: application/json

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You should write the body in your request exactly the same as written when calculating the headers.