A 807 Invalid combination of shopper interaction and recurring contract response after trying to perform a recurring payment means that you provided a wrong shopper interaction for the recurring contract.

To troubleshoot double check the following things:

• Confirm that you are passing in the shopperInteraction object. Note that, by default the shopperInteraction is set to Ecommerce. This means that if it is not passed in One-click payments, they might be successful without the shopperInteraction object.
• Additionally, confirm that you are passing in the correct value for the shopperInteraction object. For One-click payments the shopperInteraction should be set to Ecommerce, for Recurring payments it should be set to ContAuth.