Block a user
Clear persister from handler in outer code aswell
Use numeric prefixes in voucher data
I suggest subprefix + 256 value (set first bit on second byte) to clearly separate from other user data
Replace DATATYPE_USERSUB with DATATYPE_USERDATA
Investigate Dear Customer messages
Currently this error seems to be caused by urdt/ussd#175
Attempted fix is in.
Create minimal data seeding script for local dev bootstrap