Can you elaborate on what you mean by "custom button on the orders"? Do you want to add the button to the Register App? If yes, then I'm afraid that's not possible.
I want to show a screen that the client interacts with right before they pay or right after they pay. Does that help?
I thought if there was not way to have something pop up when server starts the payment process, maybe I can make a button that they press which launches my screen, then contnues with the payment process.
You can listen for a payment being successfully processed and display your screen then. Of course, remember to make sure the screen is able to return to the normal flow for the next transaction.
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