Create Cash on Delivery payment method
From your Shopify admin, go to Settings > Payments.
In the Manual payment methods section, select pre-defined manual payment method called Cash on Delivery (COD)
Fill in the following fields
In Additional details, enter any information that you want shown next to the payment method in your checkout.
In Payment instructions, enter the instructions that you want your customer to follow to pay for the order. These instructions are shown on the order confirmation page after the customer completes their order.
Click Activate Cash on Delivery (COD).
Now, if the customer selects this payment method, it will automatically be saved as Cash on Delivery in Packeta.
Other manual payment methods will not work.