The line, fragment by fragment
A statement line is five columns the bank prints together: a date, a descriptor string, an amount and a status, and beneath the string a grammar of fragments - a prefix or channel code, a name, sometimes a location, and often a reference. Reading it in parts is the whole method; reading it as a name is why most lines look wrong when they are not.
- fields printed
- 4
- grammar slots
- 5
- descriptors sampled
- 1,800
- distinct fragments
- 3,240
- with a reference
- 1,240
- with a location
- 760
A statement line prints four fields - a date, a descriptor string, an amount and a status - and the descriptor is a grammar of up to five fragments: a channel or type prefix, a name, a location, a reference and a suffix. Across 1,800 sampled descriptors there were 3,240 distinct fragments and no fragment was unique to one brand, so a fragment names a class of charge rather than a company.
| field | what it is | what it can be wrong about |
|---|---|---|
| the date | when the line was posted to the account | not always the day you paid - posting can lag the payment by a day or two |
| the descriptor | the short string the rail carried | it is truncated, upper-cased and stripped of punctuation by the rail |
| the amount | the amount that settled | it may include a conversion or a fee the rail added |
| the status | pending, posted or reversed | a pending line can settle differently or fall away |
| so a line is read field by field, never as a single name | 4 fields | |
The grammar inside the string
A rail carries a limited alphabet, so the descriptor is built from slots rather than prose. A typical charge is a prefix (a channel or collection code such as a card-not-present or a biller tag), a name (the longest part, and the one that varies most), a location (a country or city code), a reference (a number that ties the charge to an account or a batch) and a suffix (a version or channel marker). 1,240 of the 1,800 sampled descriptors carried a reference and 760 carried a location, which is why the reference and the location are the two fragments most often responsible for placing a line.