php - Transaction id is invalid 10609

Solution:

Two things:

First, in paypal_pay_redirect.php, addPAYMENTREQUEST_0_PAYMENTACTION => 'Authorization' to$orderParams.

Second, in paypal_success.php, changePAYMENTACTION TOPAYMENTREQUEST_0_PAYMENTACTION.

Here's why:

In your SetExpressCheckout call, if you don't setPAYMENTREQUEST_0_PAYMENTACTION, PayPal assumes that it will beSale. And if this is set toSale in your SetExpressCheckout call, then PayPal will only allow you to set it toSale on your DoExpressCheckoutPayment call.

Additionally, in your DoExpressCheckoutPayment call, you're mixing new and old-style variable names. (Some variables, such asPAYMENTACTION, were renamed when PayPal introduced parallel payments for Express Checkout.PAYMENTACTION is the old style;PAYMENTREQUEST_0_PAYMENTACTION is the new style.) When you mix old-style and new-style names like this, PayPal recognizes variables using one style, and ignores the other. In your case,PAYMENTREQUEST_0_AMT andPAYMENTREQUEST_0_CURRENCYCODE are being recognized, butPAYMENTACTION is being ignored.

The combination of these two factors means that your transaction is most likely being run as a Sale transaction, not an Authorization. Since you can't capture against a Sale transaction (since it's technically already captured), PayPal responds by saying that the transaction ID is invalid.

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