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Why did I get API error code 10423?

PayPal returned API error code 10423 - This transaction cannot be completed with PaymentAction of Authorization.

You set PaymentAction to "Sale" with SetExpressCheckout at the first API call. If you receive this error at the DoExpressCheckout API call, you can set PaymentAction to "Authorization."

PayPal doesn't allow this switch from "Sale" to "Authorization" in a single checkout session. PayPal recommends using the same PaymentAction for the DoExpressCheckout API call as is used in the initial SetExpressCheckout API call to avoid this issue.

See Also
How Create One-Time Payments Using Express Checkout
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