# Payflow Gateway Reference (/api/nvp-soap/payflow/integration-guide/reference)



This section of the guide includes reference content for your Payflow integration.

* [Revision History](/api/nvp-soap/payflow/integration-guide/reference/revision-history/)
* [Country codes](/api/nvp-soap/payflow/integration-guide/reference/country-codes/)
* [Units of measurement](/api/nvp-soap/payflow/integration-guide/reference/units-of-measurement/)
* [Verbosity Parameter](/api/nvp-soap/payflow/integration-guide/reference/verbosity/)
* [Additional Processor Information](/api/nvp-soap/payflow/integration-guide/reference/additional-processor-info/)