Check in this order
- 1
Where it is applied
Saved codes are applied by you in the quote or invoice builder (Billing amount → Add Discount). Customers do not type codes on the pay page.
- 2
Code exists and is active
Settings → Discounts: the code must exist, be active, and match exactly (no spaces).
- 3
Already sent
A sent invoice's total is fixed. Add the discount with a credit note (Credit Notes & Refunds) or edit and resend if unpaid.
- 4
Cash discount
That is the separate Settings → Billing → Offer a cash discount switch; it only applies when you record a full cash or check payment with Apply cash discount ticked.
- 5
Member discount
Comes from an active service agreement with Member discount set; it applies automatically to that customer's new quotes and invoices, not via a code.
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