Name payment handlers the way the spec does
A payment handler is not named in the spec's dotted form (e.g. com.google.pay).
Why it matters
Handlers are named like reversed web addresses (com.google.pay, com.stripe.terminal) so every store declaring the same payment method names it the same way, and an agent can recognise it.
Show fix
"payment_handlers": {
"com.google.pay": [...]
}
