BITCOIN payments OP RETURN parameter

Question

I want to automate BITCOIN payments and I need to make a donate button that sends an additionally OP_RETURN parameter with the value of the encrypted order id. I just want to send a small message with the payment. I have documented myself a little bit and I saw that the OP_RETURN parameter may help me. How do I make that happen? Is there a wallet that does that or Do I have to do it from bitcoin-cli?

I also want to make this in PHP. I mean I need a button that will make a payment with that encrypted order id.

Thanks for your advice in advance.

Answer 1

You will want to do the server-side through the encrypted and authenticated client using BIP 70 - AKA which is the Bitcoin Protocol for Payments. You can create a browser-side client to do as you described but you do not want to trust the data the client sends along without verification and you checking the transaction before it is sent to the network will not make you trustworthy as a merchant but rather an aim between the user and the blockchain.