HTTP 400 · Bad Request
HTTP 400 Other

When & why it happens

The phone hash has aged out. Request a fresh one and retry.

Handling in gogram

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

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