Attach external payment method

Attaches an external payment method (from Stripe or other provider) to a customer. Connector Auto-Detection:

  • If 'connector' is not provided, the system will automatically detect the connector by querying resource mappings
  • If exactly one connector mapping exists for the customer, it will be used automatically
  • If multiple connector mappings exist, you must explicitly specify which connector to use
  • If no connector mappings exist, an error will be returned
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