CashApp doesn't recognize invoice as "Bitcoin Wallet" when scanning QR code

[pretyflaco]

Describe the bug
Customer reported that "when scanning the BTCPay QR code, I get an error that it's not a Bitcoin wallet"

The BTCPay instance version is v1.0.6.0.

To Reproduce
Don't have CashApp to reproduce.

Expected behavior
Recognize either on-chain or off-chain invoice

[pavlenex]

Hi, we need a bit more context to the issue.

What's the address format that you're using for your wallet? SegWit/Legacy/P2SH? Do you by any chance have the Include lightning invoice fallback to on-chain BIP21 payment url enabled in Store > Checkout experience?

[britttttk]

I can reproduce this @pretyflaco regardless of wallet type it will not work, it gives the error you mentioned. I tried with and without payment amounts specified in cash app.

I can however send to the BTCPay Wallet's Receive page from cash app.

[pavlenex]

Could be due to BIP21 fallback. Let's see.

[britttttk]

I can reproduce it does not work with or without: lightning/payjoin/bip21.

[pretyflaco]

Address format is P2SH
Include lightning invoice fallback to on-chain BIP21 payment url is not enabled

[britttttk]

It works in version 1.0.5.9 but stopped in 1.0.6.0

[pavlenex]

Ok so the issue is most likely that we've added uppercase for the QR in 1.0.6.0
BITCOIN:BC1XYZ?amount=0.00000001 vs bitcoin:bc1xyz?amount=0.00001 So uppercase BITCOIN which should be according to BIP21 protocol isn't recognized by the CashApp. Would be good to test this with a few other wallets.

[rockstardev]

So uppercase BITCOIN: which should be according to BIP21 protocol isn't recognized by the CashApp.

I think it's likely that BITCOIN: is supported, but uppercased Bech32 address in QR code is not supported. @britttttk since you have CashApp can you go to:

https://www.the-qrcode-generator.com

And then try following combinations:

BITCOIN:BC1Q6APR55WRXTDTK3CJ6M69MXAYW99VVGTVDNVUNT?amount=0.00005142
BITCOIN:bc1q6apr55wrxtdtk3cj6m69mxayw99vvgtvdnvunt?amount=0.00005142
bitcoin:BC1Q6APR55WRXTDTK3CJ6M69MXAYW99VVGTVDNVUNT?amount=0.00005142
bitcoin:bc1q6apr55wrxtdtk3cj6m69mxayw99vvgtvdnvunt?amount=0.00005142

Obviously don't send any funds... just see if QR codes generated can be scanned.

[britttttk]

@rockstardev

1. No
2. No
3. Yes - bitcoin:BC1Q6APR55WRXTDTK3CJ6M69MXAYW99VVGTVDNVUNT?amount=0.00005142
4. Yes - bitcoin:bc1q6apr55wrxtdtk3cj6m69mxayw99vvgtvdnvunt?amount=0.00005142