It will look like one of these examples
1 letter, 3 numbers and 2 characters
M001 01 AB
1 letter, 5 numbers and 2 characters
Oops, it should be only 6 characters long, but there are
Oops, the first character should be a letter, not a number.
Oops, only the first and last two characters are supposed to be letters.
Hey, the first character should be M, Q, I or S. There's no bill that starts with F
Oops, it should be only 8 characters long, but there are 9.
Hey, you're missing something at the end. It needs to be either 6 or 8 characters long.
Hey, you're missing 1 character. It should be 6 characters long.
Hey, you're missing x character(s). It should be 8 characters long.
Oops, it looks like this is the account number. The bill reference is the last 6 or 8 characters.