Wait, "clients and customers" repeats, so maybe adjust to "buyers|clients|patrons" and "clients|patrons|users" to avoid redundancy.
"Verify the Code: The activation code is verified by the business or the customer to ensure that the invoice is legitimate." Covered "verified" earlier.
I should start by reading through the text carefully. The best practices section has three points: using unique codes, verifying codes, and keeping records. In the challenges section, there's a code generation challenge and a code verification challenge (though the latter is cut off, but maybe the user is providing part of the text).
