Hello,

Payment key is not stored anywhere in database. We generate this encrypted string from payment id.
I suggest you not to activate manually, you need to wait for notification , if you manually activated then the notification will not log in payplans and in future if you find any issue then we will not able to track the issue.

Still you want to generate this payment key then use below mentioned code.

$payment_key = XiHelperUtils::getKeyFromId($paymentId);

$paymentId in this variable you need to pass payment id.

Let me know if you have any query.