Why did I get API error code 10209?

PayPal returned error code 10209 - Preapproved Payments not enabled

BAUpdate or DoReference Transaction calls were used but Preapproved Payments (PAP) isn't enabled for the merchant.

Preapproved Payments is no longer an available product for PayPal merchants. Instead, you can use an alternative option such as Reference Transactions or PayPal for Partners.

Note: See the Developer Portal for a complete list of NVP/SOAP API error codes.

See also:
Reference Transactions
PayPal for Partners