How does PayPal signal a transfer? What URL is used with what parameters or HTTP headers?
As my first tests did not work, I suspect that our custom-built caching mechanism is interfering with the message. Thus I would need to know, what exactly I need to allow to pass caching.
Hi, check the following documentation. Let me know if this helps you.
Thanks! I had read that documentation. But somehow the URL that I entered at PayPal was not picked up correctly – maybe it had to do with it being a sandbox account? It always send its info to the root of the site, i.e. https://www.mydomain.com/
But I was able to identify the GET-parameter, for which I could filter (and deactivate caching):
swpm_process_ipn. With this, I a am happy.
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