This feature is available from the Professional plan
How to Enable Receipts
To generate receipts, go to Settings > Payments, enter your billing information, and enable receipt generation.
Where Can I Find Receipts for a Client?
In your administration panel, go to Order Management > Client Orders > Action > click the three dots > Download receipt.
Where to Add the Client's Billing Information?
If you want the client's billing details to appear on their receipt, fill them in on the client's detail page.
Where Can My Client Find Their Receipt?
Clients can download their receipts from the My Orders section after logging into the system.
You can share this help article with them: Where can I download my receipts