Start with the right order
A simple offer might use website → checkout → confirmation → delivery. A custom service may require consultation → proposal → signed agreement → deposit → onboarding.
Build it step by step
Connect the steps a customer takes.
Map the complete path from first visit to a finished service.
Define each trigger
Write what moves someone forward: an approved quote, signed agreement, verified payment, booked appointment, or staff review.
Provide a clear next action
Every confirmation should explain what happened, what is next, who is responsible, and where to ask questions.
Test exceptions
Plan for abandoned checkout, declined payments, unsigned agreements, no-shows, corrections, and cancellations. Avoid treating a click as completion.