We now have quite a few successful experiments paying btcpayserver from Joinmarket, including when btcpayserver is an onion endpoint. Looking pretty good, but there are obviously teething problems going to surface here and there.
Syntax is `python sendpayment.py walletname.jmdat bip21uri` where bip21uri you just copy-paste from the btcpayserver invoice page (if the server has payjoin, it'll automatically get the `pj=` parameter in there).
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