Is there a widespread-implemented payment request URL specification?

Hi! I have almost finished building my payment processor, and one of our users told that the URLs we use in qr codes might not work. I tested them with metamask, but coinbase wallet for example didn't work. I used https://eips.ethereum.org/EIPS/eip-681, and here's a sample URL generated:
ethereum:0x679cA543f1d82f377B2E401da47fB5C6C9b4D157@42?value=0.00001
But it is probably not implemented everywhere. In our case it is required for user to enter exact amounts. Is there a standard which works everywhere?