Hi, i am trying to set up recurring payments with the Smart Payment Button. Basically i did this https://developer.paypal.com/docs/subscriptions/integrate/ and set up some IPN receive script on my server. It all works fine so far but i can't add an Invoice ID in Paypal to my Recurring Payments which i need for accounting. It seems to be possible since other recurring payments i have from other merchants seem to be able to do it: How can i create or pass an Invoice id for every single recurring payment with my setup?
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