If not done already, the final part of the set-up process is to connect a payment gateway. It is really important to set this up properly since this is how you will receive money for the delivery orders.
From the side menu, go to Settings > Setup Payments and select either Stripe or Square. Both are very safe payment platforms, and connecting either of them is really easy, by simply following the prompts.
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The following video explains this whole process step by step:
Who pays for the Delivery Fee?