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docs(discount): document usage-limit and stacking-conflict rejection codes #577

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docs(discount): document usage-limit and stacking-conflict rejection …
prateek-ct Jul 10, 2026
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docs(discount): fix table column alignment
prateek-ct Jul 14, 2026
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29 changes: 21 additions & 8 deletions docs/specification/discount.md
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Expand Up @@ -172,14 +172,27 @@ via the `messages[]` array:

**Error codes for rejected discounts:**

| Code | Description |
| -------------------------------------- | ------------------------------------------- |
| `discount_code_expired` | Code has expired |
| `discount_code_invalid` | Code not found or malformed |
| `discount_code_already_applied` | Code is already applied |
| `discount_code_combination_disallowed` | Cannot combine with another active discount |
| `discount_code_user_not_logged_in` | Code requires authenticated user |
| `discount_code_user_ineligible` | User does not meet eligibility criteria |
| Code | Description |
| -------------------------------------- | ------------------------------------------------------------------------------ |
| `discount_code_expired` | Code has expired |
| `discount_code_invalid` | Code not found or malformed |
| `discount_code_already_applied` | Code is already applied |
| `discount_code_combination_disallowed` | Cannot combine with another active discount |
| `discount_code_usage_limit_reached` | Code has reached its maximum number of allowed uses |
| `discount_code_stacking_conflict` | Code is valid, but a higher-priority discount already applied takes precedence |
| `discount_code_user_not_logged_in` | Code requires authenticated user |
| `discount_code_user_ineligible` | User does not meet eligibility criteria |

`discount_code_usage_limit_reached` differs from `discount_code_already_applied`:
the latter means the buyer is trying to apply a code that is already active on
*this* cart or checkout; the former means the code's overall usage allowance
(global or per-customer) has been exhausted by other carts/customers.

`discount_code_stacking_conflict` differs from `discount_code_combination_disallowed`:
the latter means the business has an explicit rule that these specific
discounts cannot combine; the former means the code matched and was valid,
but discount-stacking or best-deal resolution rules resulted in a different,
already-active discount taking precedence instead.

## Automatic Discounts

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