It looks like the credit card numbers are included in the Blippy section starting with "The purchase appears on your statement as:", followed by the actual text

It looks like the credit card numbers are included in the Blippy section starting with "The purchase appears on your statement as:", followed by the actual text of the line entry from the statement. From that, I'm guessing that Blippy lets users automatically import their credit card statements, but they didn't anticipate that the entries in those credit card statements would occasionally include full credit card numbers. Embarrassing but a corner case.