Wizard

A four-step setup. Each step asks about one topic, shows where you are, and saves as you go.

Consumer provides: the steps, each step’s fields, and the save handler.

• Show the Stepper at the top and “Step 2 of 4” under the heading. The h1 names the step.
• Back is on the left, the forward button on the right and names the next step (“Continue to payments”). Back never loses what was entered.
• Offer “Save and finish later” on every step.
• The last step is Review: every answer with a Change link back to its step, then one button to finish.
• On error, stay on the step and show the error summary; do not jump to another step.