HTTP 400 · Bad Request
HTTP 400 Authentication

When & why it happens

The phone number does not match the expected E.164 format or is otherwise unrecognized.

Handling in gogram

Surfaced as *gogram.ErrResponseCode. Match on the message:

if err, ok := err.(*gogram.ErrResponseCode); ok { if err.Message == "PHONE_NUMBER_INVALID" { // handle this error } }