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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