The answer
Payjoin changes payment negotiation and often works alongside normal Bitcoin invoices, but merchant software must support compatible negotiation, endpoint handling and fallback transactions.
What to do next
Check the merchant processor's Payjoin implementation and test a normal payment fallback before switching on production invoices.
BTCPay Server — Bitcoin checkout software
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BitBox Bitcoin hardware wallet
A Bitcoin self-custody device to compare; it does not make on-chain transactions anonymous or prevent address linking.
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