I want to automate BITCOIN payments and I need to make a donate button that sends an additional 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 OP_RETURN parameter may help me.
OP_RETURN : http://bitzuma.com/posts/op-return-and-the-future-of-bitcoin/
How do I make that happen? Is there a wallet that does that? Or I have to do it from bitcoin-cli?
I also want to make this in PHP and here is an example that i don't understand : https://github.com/coinspark/php-OP_RETURN
I mean I need a button that will make a payment with that encrypted orde