When tipping is enabled, every customer-facing invoice that can be paid online shows a tip control just above Pay Now. This guide walks through what your customer sees so you can help them — it’s the same control whether they open the invoice from the link you emailed or from their customer portal.
Before you start: make sure tips are turned on (see enable invoice tips) and the invoice has an online payment link (your Stripe account is connected). The tip control only appears on invoices a customer can pay online.