Clickatell - WhatsApp Template - One API

Question

I try to send a WhatsApp template message using the Clickatell One API end point.

Here is my payload. I'm send this against the endpoint with POST.

{
    "messages":[
       {
          "to":"***********",
          "channel": "whatsapp",
          "hsm" : {
             "template":"welcome_notification_demo",
             "parameters" : {
                "1":"John",
                "2":" Clickatell"
             }
          }
       }
    ]
 }

I receive the following response from them:

{
    "messages": [
        {
            "error": {
                "code": 23,
                "description": "Invalid or missing parameter: HSM ."
            },
            "accepted": false,
            "to": "*********"
        }
    ],
    "error": null
}

Can anyone tell me what I am missing in my payload?
(The documentation is not at all useful.)

Note: I used ********** to hide my phone number.

Thanks!

Answer 1

From the support team:

"The cause of the error is that you are attempting to send a Default Whatsapp Template from a verified Whatsapp Business Number. Please retest by using one of your approved custom templates and advise us if the issue continues."

So I tried with one of our custom templates and it worked!

(Would be nice if the documentation mentioned that you can't test with a default template)