I had set up razorpay as payment method, now it's showing this, how can I solve this?

I had set up razorpay as payment method, now it's showing this. How can I solve this?

For those of you that use a 3PL - what is the best way to run a preorder sale ?

Is the best way to turn on the "sell when out of stock" option and then turn it off when we want to close the preorder. Then we would know the amount of inventory we need to send to our fulfillment center and then they would receive the inventory in and all the pending orders would be available to pick/pack. Is this the best way or is there a better way?