Magento 2.4.2 In my case it turns out it was a instore pickup extension that I installed. To find out what it was, this is what I did. Under stores > configuration > sales > payment method > PayPal configure > Advanced Settings Set Debug mode to Yes And just in case it helps Under stores > configuration > sales > payment method > PayPal configure > PayPal Billing Agreement Settings Set Debug mode to Yes Check your system log in var > log And payment.log is here if you want some info on the PayPal transaction This is the error I got main.CRITICAL: Exception message: Notice: Undefined index: in /public_html/app/code/FME/StorePickup/Observer/SavePickUpObserver.php To test, I turned off all delivery methods except Flat rate and then I was able to process an order.
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