You can sell any product as a custom charge during checkout.

1. On the first Checkout screen, tap on "EDIT"
2. Type in the name of the product
3. Tap "Custom charge:" to add it to your line item list
4. Select the tax rate and price
5. Tap the "+" icon to add the service total

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/08316d64-5923-4d70-80d1-4a5386d869c2/Simulator_Screen_Recording_-_iPhone_11_-_2021-05-12_at_22.07.18.mp4

<aside> 💡 We recommend processing services and products as two separate transactions to avoid over-inflating the tip.

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