Can I add a service charge to QR table orders?

It depends on your tools and country. Square's QR ordering can add an optional service fee. In India, adding a service charge by default is not allowed.

• Square QR ordering can add an optional service fee, and you keep it minus standard processing fees.
• Square for Restaurants also lists service charges and automatic gratuity.
• India: the 2022 guidelines say no automatic or default service charge, and no forcing it.
• It must not be added to the bill for GST. Check your local rules.