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c#asp.netpaypalwebformspaypal-ipn

PayPal IPN Listener in C#

I'm seeing two different and contradictory statements in PayPal's API documentation.

When we send the parameters BACK to PayPal we add the "&cmd=_notify-validate" parameter. My question is, do we add it to the start of the query parameter list, or the end of it?

Here, we add it to the start of the parameter list, whereas here, we add it to the end.

Which is correct?

Solution

  • It doesn't matter. Both will work. It is much more forgiving than the docs imply.

    This is based on personal experience. Feel free to test it yourself to verify.