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The_Werkstatt -
Lorenz JotForm SupportHi The_Werkstatt,
Thanks for reaching out to us for help. Currently, when using user-defined amount payment type, the Stripe checkout page only display the total amount of what your payment will be and the email address(if there's any) entered in the email field.
If you want to pass certain information along with each transaction, you can use the Stripe Checkout's Custom Data Field. It gives you more control over the information you want store in Stripe. You can check out this guide on How to send Custom Data to Stripe Payment.
Let us know if you have any other questions.