feat: Add support for non-catalog discounts (#124)

Author: davidgrayston-paddle

CHANGELOG.md

@@ -10,6 +10,7 @@ Check our main [developer changelog](https://developer.paddle.com/?utm_source=dx
 
 ### Added
 
+- Non-catalog discounts on Transactions, see [changelog](https://developer.paddle.com/changelog/2025/custom-discounts?utm_source=dx&utm_medium=paddle-python-sdk)
 - Support `retained_fee` field on totals objects to show the fees retained by Paddle for the adjustment.
 - Added support for new payment methods `blik`, `mb_way`, `pix` and `upi`. See [related changelog](https://developer.paddle.com/changelog/2025/blik-mbway-payment-methods?utm_source=dx&utm_medium=paddle-python-sdk).
 

paddle_billing/Resources/Transactions/Operations/CreateTransaction.py

@@ -15,6 +15,9 @@
     TransactionCreateItemWithPrice,
     CreateBillingDetails,
 )
+from paddle_billing.Resources.Transactions.Operations.Discount.TransactionNonCatalogDiscount import (
+    TransactionNonCatalogDiscount,
+)
 
 
 @dataclass
@@ -31,3 +34,4 @@ class CreateTransaction(Operation):
     billing_details: CreateBillingDetails | None | Undefined = Undefined()
     billing_period: TimePeriod | None | Undefined = Undefined()
     checkout: Checkout | None | Undefined = Undefined()
+    discount: TransactionNonCatalogDiscount | None | Undefined = Undefined()

paddle_billing/Resources/Transactions/Operations/Discount/TransactionNonCatalogDiscount.py

@@ -0,0 +1,17 @@
+from __future__ import annotations
+from dataclasses import dataclass
+
+from paddle_billing.Undefined import Undefined
+from paddle_billing.Entities.Shared.CustomData import CustomData
+from paddle_billing.Entities.Discounts.DiscountType import DiscountType
+
+
+@dataclass
+class TransactionNonCatalogDiscount:
+    amount: str
+    description: str
+    type: DiscountType
+    recur: bool | Undefined = Undefined()
+    maximum_recurring_intervals: int | None | Undefined = Undefined()
+    custom_data: CustomData | None | Undefined = Undefined()
+    restrict_to: list[str] | None | Undefined = Undefined()

paddle_billing/Resources/Transactions/Operations/Discount/__init__.py

@@ -0,0 +1,3 @@
+from paddle_billing.Resources.Transactions.Operations.Discount.TransactionNonCatalogDiscount import (
+    TransactionNonCatalogDiscount,
+)

paddle_billing/Resources/Transactions/Operations/PreviewTransaction.py

@@ -7,6 +7,9 @@
     TransactionItemPreviewWithPriceId,
     TransactionItemPreviewWithNonCatalogPrice,
 )
+from paddle_billing.Resources.Transactions.Operations.Discount.TransactionNonCatalogDiscount import (
+    TransactionNonCatalogDiscount,
+)
 
 
 @dataclass
@@ -16,3 +19,4 @@ class PreviewTransaction(Operation):
     currency_code: CurrencyCode | None | Undefined = Undefined()
     discount_id: str | None | Undefined = Undefined()
     ignore_trials: bool | Undefined = Undefined()
+    discount: TransactionNonCatalogDiscount | None | Undefined = Undefined()

paddle_billing/Resources/Transactions/Operations/PreviewTransactionByAddress.py

@@ -7,6 +7,9 @@
     TransactionItemPreviewWithPriceId,
     TransactionItemPreviewWithNonCatalogPrice,
 )
+from paddle_billing.Resources.Transactions.Operations.Discount.TransactionNonCatalogDiscount import (
+    TransactionNonCatalogDiscount,
+)
 
 
 @dataclass
@@ -17,3 +20,4 @@ class PreviewTransactionByAddress(Operation):
     currency_code: CurrencyCode | None | Undefined = Undefined()
     discount_id: str | None | Undefined = Undefined()
     ignore_trials: bool | Undefined = Undefined()
+    discount: TransactionNonCatalogDiscount | None | Undefined = Undefined()

paddle_billing/Resources/Transactions/Operations/PreviewTransactionByCustomer.py

@@ -7,6 +7,9 @@
     TransactionItemPreviewWithPriceId,
     TransactionItemPreviewWithNonCatalogPrice,
 )
+from paddle_billing.Resources.Transactions.Operations.Discount.TransactionNonCatalogDiscount import (
+    TransactionNonCatalogDiscount,
+)
 
 
 @dataclass
@@ -18,3 +21,4 @@ class PreviewTransactionByCustomer(Operation):
     currency_code: CurrencyCode | None | Undefined = Undefined()
     discount_id: str | None | Undefined = Undefined()
     ignore_trials: bool | Undefined = Undefined()
+    discount: TransactionNonCatalogDiscount | None | Undefined = Undefined()

paddle_billing/Resources/Transactions/Operations/PreviewTransactionByIP.py

@@ -7,6 +7,9 @@
     TransactionItemPreviewWithPriceId,
     TransactionItemPreviewWithNonCatalogPrice,
 )
+from paddle_billing.Resources.Transactions.Operations.Discount.TransactionNonCatalogDiscount import (
+    TransactionNonCatalogDiscount,
+)
 
 
 @dataclass
@@ -17,3 +20,4 @@ class PreviewTransactionByIP(Operation):
     currency_code: CurrencyCode | None | Undefined = Undefined()
     discount_id: str | None | Undefined = Undefined()
     ignore_trials: bool | Undefined = Undefined()
+    discount: TransactionNonCatalogDiscount | None | Undefined = Undefined()

paddle_billing/Resources/Transactions/Operations/UpdateTransaction.py

@@ -15,6 +15,9 @@
     TransactionUpdateItemWithPrice,
     UpdateBillingDetails,
 )
+from paddle_billing.Resources.Transactions.Operations.Discount.TransactionNonCatalogDiscount import (
+    TransactionNonCatalogDiscount,
+)
 
 
 @dataclass
@@ -31,3 +34,4 @@ class UpdateTransaction(Operation):
     billing_details: UpdateBillingDetails | None | Undefined = Undefined()
     billing_period: TimePeriod | None | Undefined = Undefined()
     checkout: Checkout | None | Undefined = Undefined()
+    discount: TransactionNonCatalogDiscount | None | Undefined = Undefined()

tests/Functional/Resources/Transactions/_fixtures/request/create_with_noncatalog_discount_full.json

@@ -0,0 +1,22 @@
+{
+  "items": [
+    {
+      "quantity": 1,
+      "price_id": "pri_01he5kxqey1k8ankgef29cj4bv"
+    }
+  ],
+  "discount": {
+    "amount": "500",
+    "description": "Black Friday",
+    "type": "flat",
+    "recur": true,
+    "maximum_recurring_intervals": 3,
+    "custom_data": {
+      "source": "bf2025"
+    },
+    "restrict_to": [
+      "pro_01gsz4t5hdjse780zja8vvr7jg",
+      "pro_01gsz4s0w61y0pp88528f1wvvb"
+    ]
+  }
+}