Fulfilling a product sample - Shipping payment method

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Scenario: I have sample products in my warehouse and have created a manual order to send them to a customer, who will later return them. I am paying for the shipping.


Question: Do I fulfil the order like I am the customer and use my credit card to pay for the shipping OR if I "mark as paid" and ship it, will the shipping costs be added to my monthly Shopify bill??


Is there another way I should be doing this?