post
https://pay.rezolve.com/api/v1/payment-methods//set-default
Marks one saved card as the shopper's default — the card checkout pre-selects. On success every other saved method for the same merchant and shopper is cleared, so the target ends as the only default.
Shopper binding matches /checkout/lookup: the token must resolve for the supplied email, and the target method must belong to the token's merchant, that normalized email, and the merchant's active PSP provider.
| Field | Type | Required | Description |
|---|---|---|---|
| widget_token | string | Yes | Active widget token. Merchant auth headers are not required. |
| customer_email | string | Yes | The shopper. Must match the email the token resolves for. |
Reading it back: There is no read endpoint for saved cards of its own — POST /api/v1/checkout/lookup returns them, each carrying is_default. Re-run the lookup after a change to refresh the list.
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