Customer permission to call: how to ask and how long it lasts

Meta's rule: on an official line a business does not call first until the customer agrees. The customer agrees once, in WhatsApp itself, by pressing a button in our message. On our line (ordinary WhatsApp) this is not needed — read on only for the official line.

1. Start a call as usual. If there is no permission, the «Call permission request» window opens with the hint «The customer has not allowed calls yet.»
2. Choose a request template. If the list is empty («This line has no approved call permission template.»), create one: when creating the template turn on «Request permission to call» — WhatsApp templates.
3. Press «Send request». The customer gets a WhatsApp message with an «Allow WhatsApp calls» button. After sending you see «Request sent.»
4. When the customer presses the button you get «The client allowed calls — you can call.» Call.