Function ownsPaymentMethod

ownsPaymentMethod(
    cfg: StripeConfig,
    customerId: string,
    pmId: string,
): Promise<boolean>
Whether pmId belongs to customerId — guards set-default / detach against another customer's card.
Parameters
- cfg: StripeConfig
- customerId: string
- pmId: string
Returns Promise<boolean>
- Defined in packages/billing/src/billing.ts:123