Hi guys, had a detailed view at IPN / PDT functionality and the description above. But maybe you can help me with the following question: What is the best practice to send a unique identifier (which I generated on my server side) to Paypal which I always get back from the Paypal server after payment has successfully/unsuccessfully been processed (regardless if PDT or IPN) to ensure I can always identify the paying user? Is this the "custom" (cm) field or is there a better field to use (maybe something like e.g. token, hash)? Thanks and best regards Eric
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