The standard check format for both Accounts Payable and Payroll  is Stub/Check.  These can be modified with the APC product, to be stub/check/stub and both formats will work with Blackbaud forms.

Blackbaud provides Forms FW521 and FW522 for Accounts Payable and FW523 for Payroll.
The Blackbaud Forms Catalog showing these forms is available on the Blackbaud Website.