This PR is adding discount coupon feature to vendor

[Ndevu12]

Description

This PR introduces the discount coupon feature, allowing vendors to create, manage, and apply discount coupons to customer orders. Key changes include database schema updates, new API endpoints, and comprehensive testing.

Changes Made

Database Design

• Created a coupons table with columns for ID, code, discount type/value, expiration date, usage counts, vendor ID, product IDs, and timestamps.
• Updated vendors, customers, orders, and customerCoupons tables for relationships with coupons.

API Endpoints

• Create Coupon: POST /api/coupons
• Apply Coupon: POST /api/checkout/apply-coupon
• Get Vendor Coupons: GET /api/vendors/:vendorId/coupons

Testing

• Added unit tests for coupon functionality.
• Added integration tests for API endpoints.

Documentation

• Updated API documentation with new coupon endpoints.

[faid-terence]

@Ndevu12 This is not a proper PR Title , please rename it

[Ndevu12]

@faid-terence renamed

[coveralls]

Pull Request Test Coverage Report for Build 9234922337

Details

• 154 of 185 (83.24%) changed or added relevant lines in 11 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.4%) to 78.743%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/services/couponServices/deleteCoupon.ts	12	14	85.71%
src/services/couponServices/readCoupon.ts	12	14	85.71%
src/services/couponServices/accessAllCoupon.ts	14	20	70.0%
src/services/couponServices/createCouponService.ts	33	40	82.5%
src/services/couponServices/updateService.ts	27	41	65.85%
<!--	Total:	154	185	83.24%	-->

Files with Coverage Reduction	New Missed Lines	%
src/startups/dbConnection.ts	1	87.5%
<!--	Total:	1		-->

Totals
Change from base Build 9220370301:	-0.4%
Covered Lines:	1403
Relevant Lines:	1667

---

💛 - Coveralls

[faid-terence]

@Ndevu12 Why did you delete these tests ??

[Ndevu12]

@Ndevu12 Please get all tests back , you deleted them !!!

@faid-terence Sorry for this mistake. I can't say that I didn't do it by intention. The reason for the deletion of these tests is that I was running out of time and I had been fixing the errors they had around 30 minutes. so, because I had an exam at 3:00PM. I had to do quick things so, that I can attend the exam and all others who depend on this PR can progress on their projects. If needed, I can work the tests. Am ready. Also I have managed to write API endpoints documentation

[faid-terence]

@Ndevu12 Understood but never do that again , it's selfish removing other people's work to keep yours Please work together as a team !

[Ndevu12]

@Ndevu12 Understood but never do that again , it's selfish removing other people's work to keep yours Please work together as a team !

• @faid-terence noted Sir, won't happen again, but I was trying to not keeping others not working on their works. But before any other things I will ask for a permission even if it will be urgent. Thanks for your understanding. Best regards.

[Ndevu12]

@Ndevu12 Please get all tests back , you deleted them !!!

@faid-terence Now, All tests are added back!

[Ndevu12]

PR Approved @Ndevu12 !

@faid-terence thanks for the assistance and awareness!