popertotsandSisyphus 0beaa6e117 feat(backend): add referral discount preview and transactional campaign safety ...

Add referral discount to payment preview for users with unused referral discounts.

- Check referral_discounts table for unused discounts in calculateDiscountPreview
- Wrap campaign discount application in a proper database transaction
- Apply eligibility guard for 2nd+ payments to prevent duplicate discount application

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

2026-06-20 16:58:46 +01:00

..

discount_preview_test.go

refactor(backend): replace resetTestData with SetupTestDB and add new tests

2026-06-20 16:57:36 +01:00

giftcards_test.go

fix(backend): address gift card review findings

2026-06-12 10:50:49 +01:00

giftcards.go

feat(backend): update payments handlers and service

2026-06-18 16:26:29 +01:00

handlers.go

feat(backend): add referral discount preview and transactional campaign safety

2026-06-20 16:58:46 +01:00

loyalty_test.go

refactor(backend): replace resetTestData with SetupTestDB and add new tests

2026-06-20 16:57:36 +01:00

loyalty.go

feat(backend): add loyalty constants and first-payment guard

2026-06-19 11:34:20 +01:00

payment_status_test.go

refactor(backend): replace resetTestData with SetupTestDB and add new tests

2026-06-20 16:57:36 +01:00

payments_test.go

refactor(backend): replace resetTestData with SetupTestDB and add new tests

2026-06-20 16:57:36 +01:00

refund_exclude_test.go

refactor(backend): replace resetTestData with SetupTestDB and add new tests

2026-06-20 16:57:36 +01:00

refund_policy.go

feat(backend): add loyalty constants and first-payment guard

2026-06-19 11:34:20 +01:00

refunds_test.go

refactor(backend): replace resetTestData with SetupTestDB and add new tests

2026-06-20 16:57:36 +01:00

refunds.go

feat(backend): add loyalty constants and first-payment guard

2026-06-19 11:34:20 +01:00

service.go

feat(backend): update payments handlers and service

2026-06-18 16:26:29 +01:00

testmain_test.go

refactor(backend): migrate test infrastructure to isolated databases

2026-06-20 16:56:57 +01:00

till_test.go

refactor(backend): replace resetTestData with SetupTestDB and add new tests

2026-06-20 16:57:36 +01:00

till.go

feat(backend): update payments handlers and service

2026-06-18 16:26:29 +01:00

validators.go

feat(backend): update payments handlers and service

2026-06-18 16:26:29 +01:00