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PayFlow - PPREF #482
The PayFlow gateway supports 3rd party payment processors, and it also supports PayPal itself as the payment processor.
In both cases, the API returns a PNREF value, but in the case of PayPal as the processor, it also returns a PPREF value in addition to PNREF.
We need to check to see if PPREF is available in the result, and if so, include that the same way we include PNREF in the WooCommerce order.