[Bug]: item-level discounts not applied #14580
Description
Package.json file
{
"name": "xxx",
"version": "0.0.2",
"description": "A starter for Medusa projects.",
"author": "Medusa (https://medusajs.com)",
"license": "MIT",
"keywords": [
"sqlite",
"postgres",
"typescript",
"ecommerce",
"headless",
"medusa"
],
"scripts": {
"build": "medusa build",
"seed": "medusa exec ./src/scripts/seed.ts",
"seed:categories": "medusa exec ./src/scripts/seed-categories.ts",
"start": "medusa start",
"dev": "medusa develop",
"docker:up": "docker compose up --build -d",
"docker:down": "docker compose down",
"test:integration:http": "TEST_TYPE=integration:http NODE_OPTIONS=--experimental-vm-modules jest --silent=false --runInBand --forceExit",
"test:integration:modules": "TEST_TYPE=integration:modules NODE_OPTIONS=--experimental-vm-modules jest --silent --runInBand --forceExit",
"test:unit": "TEST_TYPE=unit NODE_OPTIONS=--experimental-vm-modules jest --silent --runInBand --forceExit"
},
"dependencies": {
"@medusajs/admin-sdk": "2.12.3",
"@medusajs/cli": "2.12.3",
"@medusajs/framework": "2.12.3",
"@medusajs/medusa": "2.12.3",
"pg": "^8.13.0",
},
"devDependencies": {
"@medusajs/test-utils": "2.12.3",
"@swc/core": "1.7.28",
"@swc/jest": "^0.2.36",
"@types/jest": "^29.5.13",
"@types/node": "^20.0.0",
"jest": "^29.7.0",
"prop-types": "^15.8.1",
"react": "^18.2.0",
"react-dom": "^18.2.0",
"ts-node": "^10.9.2",
"typescript": "^5.6.2",
"vite": "^5.2.11",
"yalc": "^1.0.0-pre.53"
},
"engines": {
"node": ">=20"
}
}Node.js version
v22.19.0
Database and its version
Postgres 17
Operating system name and version
macOS Sequoia Version 15.7.2 (24G325)
Browser name
Chrome
What happended?
When applying an item-level promotion (with target_type: items) to a draft order via POST /admin/draft-orders/{id}/edit/promotions, Medusa accepts the promotion and adds it to the order's promotions array, but fails to calculate the discount. The order's discount_total remains $0.00, item totals are not adjusted, and the promotion's application_method field is missing from the response.
This bug is specific to item-level promotions on draft orders. Order-level promotions work correctly.
Test Configuration
Promotion: SPCPROD20
Retrieved from GET /admin/promotions:
{
"id": "promo_01KEJFSWKSY6X6N19J3WDXVNQS",
"code": "SPCPROD20",
"type": "standard",
"status": "active",
"is_automatic": false,
"is_tax_inclusive": false,
"application_method": {
"id": "proappmet_01KEJFSWKTQ4NMNWYKQ2J3JGC5",
"currency_code": "cad",
"max_quantity": 1,
"type": "fixed",
"target_type": "items",
"allocation": "each",
"value": 20,
"target_rules": [
{
"id": "prorul_01KEJFSWKVK0WY5YA9R06AE3QE",
"attribute": "items.product.categories.id",
"operator": "eq",
"values": [
{
"value": "pcat_01KAS4E6JEX5J2YMWJ5BV0GQZW"
}
]
}
]
}
}Key details:
- Type:
fixeddiscount of$20.00 CAD - Target Type:
items← Item-level promotion - Allocation:
each← Apply to each qualifying item - Max Quantity:
1← Apply to maximum 1 item - Target Rule: Product must be in category
pcat_01KAS4E6JEX5J2YMWJ5BV0GQZW(Pre Roll)
Test Product: Qwest 35's - Pre-roll (Grape Cream Cake)
- Product ID:
prod_01KAS4KABWBCZMPHVF7X4TGHDJ - Variant ID:
variant_01KAS4KBY2BS8Z1HPCSX3K4JJ7 - Price:
$25.99 CAD - Category ID:
pcat_01KAS4E6JEX5J2YMWJ5BV0GQZW(Pre Roll) - Product matches promotion target rule
Expected behavior
Expected Behavior
When applying a valid item-level promotion to a draft order:
- Promotion should be added to the order's
promotionsarray application_methodshould be populated in the response- Item
subtotalshould reflect the discount:$25.99 - $20.00 = $5.99 - Order
discount_totalshould show the discount:$20.00 - Item
discount_totalshould show the discount:$20.00 - Tax should be recalculated on the discounted amount:
$5.99 × 5% = $0.30 - Order
totalshould reflect the final price:$5.99 + $0.30 = $6.29
Expected Response
{
"order": {
"id": "order_01KFBYN0FF6B9RTWNQGM5GRNPN",
"status": "draft",
"subtotal": 5.99,
"discount_total": 20.00,
"discount_subtotal": 20.00,
"tax_total": 0.30,
"total": 6.29,
"items": [
{
"id": "ordli_01KFBYNP6SVCSZWTKP14025SRR",
"title": "Qwest 35's - Pre-roll",
"subtitle": "Grape Cream Cake 10 X 0.35g Pre-rolls",
"variant_id": "variant_01KAS4KBY2BS8Z1HPCSX3K4JJ7",
"product_id": "prod_01KAS4KABWBCZMPHVF7X4TGHDJ",
"unit_price": 25.99,
"quantity": 1,
"subtotal": 5.99,
"discount_total": 20.00,
"tax_total": 0.30,
"total": 6.29
}
],
"promotions": [
{
"id": "promo_01KEJFSWKSY6X6N19J3WDXVNQS",
"code": "SPCPROD20",
"type": "standard",
"is_tax_inclusive": false,
"application_method": {
"type": "fixed",
"value": 20,
"currency_code": "cad",
"target_type": "items",
"allocation": "each",
"max_quantity": 1
}
}
]
}
}Actual behavior
The promotion is accepted and added to the order, but:
- No discount is calculated
- Item totals remain unchanged
- Tax is calculated on the full price instead of the discounted price
- The
application_methodfield is completely missing from the promotion object in the responsE
Order State BEFORE Applying Promotion
GET /admin/draft-orders/{id} response:
{
"created_at": "2026-01-19T20:20:28.785Z",
"currency_code": "cad",
"discount_subtotal": 0,
"discount_total": 0,
"display_id": 10884,
"id": "order_01KFBYN0FF6B9RTWNQGM5GRNPN",
"is_draft_order": true,
"items": [
{
"id": "ordli_01KFBYNP6SVCSZWTKP14025SRR",
"metadata": {},
"product_id": "prod_01KAS4KABWBCZMPHVF7X4TGHDJ",
"quantity": 1,
"subtitle": "Grape Cream Cake 10 X 0.35g Pre-rolls",
"subtotal": 25.99,
"title": "Qwest 35's - Pre-roll",
"total": 27.2895,
"unit_price": 25.99,
"variant_id": "variant_01KAS4KBY2BS8Z1HPCSX3K4JJ7"
}
],
"metadata": {},
"promotions": [],
"region_id": "reg_01KAS4C7XRHQRVYBHJR0NKX35S",
"status": "draft",
"subtotal": 25.99,
"summary": {
"paid_total": 0,
"pending_difference": 27.2895,
"refunded_total": 0,
"transaction_total": 0
},
"tax_total": 1.2995,
"total": 27.2895,
"updated_at": "2026-01-19T20:20:52.383Z"
}Order State AFTER Applying Promotion (BUG DETECTED)
POST /admin/draft-orders/{id}/edit/promotions with body {"promo_codes": ["SPCPROD20"]}:
{
"created_at": "2026-01-19T20:20:28.785Z",
"currency_code": "cad",
"discount_subtotal": 0,
"discount_total": 0,
"display_id": 10884,
"id": "order_01KFBYN0FF6B9RTWNQGM5GRNPN",
"is_draft_order": true,
"items": [
{
"id": "ordli_01KFBYNP6SVCSZWTKP14025SRR",
"metadata": {},
"product_id": "prod_01KAS4KABWBCZMPHVF7X4TGHDJ",
"quantity": 1,
"subtitle": "Grape Cream Cake 10 X 0.35g Pre-rolls",
"subtotal": 25.99,
"title": "Qwest 35's - Pre-roll",
"total": 27.2895,
"unit_price": 25.99,
"variant_id": "variant_01KAS4KBY2BS8Z1HPCSX3K4JJ7"
}
],
"metadata": {},
"promotions": [
{
"code": "SPCPROD20",
"id": "promo_01KEJFSWKSY6X6N19J3WDXVNQS",
"is_tax_inclusive": false,
"type": "standard"
}
],
"region_id": "reg_01KAS4C7XRHQRVYBHJR0NKX35S",
"status": "draft",
"subtotal": 25.99,
"summary": {
"paid_total": 0,
"pending_difference": 27.2895,
"refunded_total": 0,
"transaction_total": 0
},
"tax_total": 1.2995,
"total": 27.2895,
"updated_at": "2026-01-19T20:21:35.678Z"
}What's Wrong
| Field | Expected | Actual | Status |
|---|---|---|---|
order.discount_total |
20.XX |
0 |
BUG |
order.discount_subtotal |
20.00 |
0 |
BUG |
order.subtotal |
5.99 |
25.99 |
BUG |
order.tax_total |
0.30 |
1.2995 |
BUG |
order.total |
6.29 |
27.2895 |
BUG |
items[0].subtotal |
5.99 |
25.99 |
BUG |
items[0].total |
6.29 |
27.2895 |
BUG |
promotions[0].code |
"SPCPROD20" |
"SPCPROD20" |
Works |
promotions[0].application_method |
{object} |
MISSING | BUG |
Order-level promotions work fine
Link to reproduction repo
N/A