diff --git a/src/interfaces/payment-stripe/entities/price.ts b/src/interfaces/payment-stripe/entities/price.ts
index 1eed5db..3cb298a 100644
--- a/src/interfaces/payment-stripe/entities/price.ts
+++ b/src/interfaces/payment-stripe/entities/price.ts
@@ -14,6 +14,12 @@ interface IPrice extends IEntity {
   updatedAt?: Date;
   product?: IProduct;
   metadata?: Record<string, any> | null;
+  customUnitAmount?: {
+    enabled: boolean;
+    preset?: number;
+    minimum?: number;
+    maximum?: number;
+  };
 }
 
 export default IPrice;
diff --git a/src/interfaces/payment-stripe/entities/transaction.ts b/src/interfaces/payment-stripe/entities/transaction.ts
index a5df05f..b0321f3 100644
--- a/src/interfaces/payment-stripe/entities/transaction.ts
+++ b/src/interfaces/payment-stripe/entities/transaction.ts
@@ -98,8 +98,6 @@ interface ITransaction extends IEntity {
   entityId?: string;
   // Smallest currency unit amount
   amount?: number;
-  // Custom amount paid by user for PWYW transactions (in cents)
-  customAmount?: number;
   // Smallest currency unit tax
   tax?: number;
   // Smallest currency unit fee
diff --git a/src/interfaces/payment-stripe/methods/price/create.ts b/src/interfaces/payment-stripe/methods/price/create.ts
index e9e0d70..53b7c65 100644
--- a/src/interfaces/payment-stripe/methods/price/create.ts
+++ b/src/interfaces/payment-stripe/methods/price/create.ts
@@ -4,8 +4,14 @@ interface IPriceCreateInput {
   productId: string;
   currency: string;
   userId: string;
-  unitAmount: number;
+  unitAmount?: number; // Optional when customUnitAmount is provided
   metadata?: Record<string, any>;
+  customUnitAmount?: {
+    enabled: boolean;
+    preset?: number;
+    minimum?: number;
+    maximum?: number;
+  };
 }
 
 interface IPriceCreateOutput {