SNAC(13,1B)  SRV_SSI_AUTHxREPLY 

This snac received when someone grant or declines you authorization, sent via SNAC(13,18). It contain screen name (uin) of the user, result flag and reason string.

 00 13   word   SNAC family
 00 1B   word   SNAC subtype
 00 00   word   SNAC flags
 xx xx xx xx   dword   SNAC request-id
 xx   byte   length of the uin string
 xx ..   string   uin string (ascii)
 xx   byte   flag: 1-auth accepted, 0-auth declined
 xx xx   word   length of the reason string
 xx xx   word   reason (message) string

Example SNAC dump with flap header:
              
  2A 02 3C 6A 00 1A 00 13  00 1B 00 00 00 01 00 1B *..j............
  07 36 32 31 38 38 39 35  00 00 05 73 6F 72 72 79 .6218895...sorry


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