[SMS] Check if unsubscribed

GET https://api.sendios.io/v3/project/{project_id}/subscription/sms/{client_user_id}

API endpoint to check if the user is unsubscribed from receiving SMS. In case of a positive response, it returns the corresponding information.

Response params	Description
project_id	Project identifier;
client_user_id	User identifier on the client's side;
source_id	Unsubscribe reason;
source	Detailed information on the unsubscribe reason;
created_at	Unsubscribe date.