Viber errors (40–59)

40 – Viber message not found

41 – invalid phone number

43 – Viber message with this ID is already present

44 – invalid payload request

45 – sender is not registered

46 – empty or too long Viber message text

47 – invalid external Viber message ID

48 – invalid Viber message expiration time

49 – invalid optional Viber message options

51 – the phone is already in the mailing list