How can I access PayPal unique transaction ID using IPN with PHP?
Can I access this from the auto return too?
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You get the transaction ID on the IPN callback. Look for PHP example code in the IPN documentation.
You can set up a sandbox account so you can do your IPN testing. This is how I did it.
Overall I found it infuriatingly difficult to figure out exactly what PayPal’s API looks like. It’s a very messy API and the documentation is very confusing.