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feat: Introduce the split payments extension #409

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feat: Introduce the split payments extension #409

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7d81ee8
introduce split payments capability and allowed combinations config
raginpirate May 2, 2026
ad777f9
improve language for temporal splits
raginpirate May 4, 2026
77c26d4
go deeper on the payment error examples
raginpirate May 6, 2026
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1 change: 1 addition & 0 deletions .cspell/custom-words.txt
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Expand Up @@ -109,6 +109,7 @@ yml
jwks
keyid
reauth
redeemables
reprepare
sandboxing
fbclid
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7 changes: 7 additions & 0 deletions docs/specification/overview.md
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Expand Up @@ -1205,6 +1205,13 @@ and cart context, then returns the resolved result. Platforms **MUST** treat the
the [Payment Handler Guide](payment-handler-guide.md#resolving-available_instruments)
for the full resolution semantics.

**Instrument Cardinality:** A checkout submission **MUST** contain exactly one
payment instrument unless the `dev.ucp.shopping.split_payments` capability is
active. Businesses **MUST** reject submissions that violate this constraint with
a `payment_failed` error in `messages[]`. See
[Split Payments](split-payments.md) for the extension that relaxes this
constraint.

### Implementation Scenarios

The following scenarios illustrate how different payment handlers and
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