diff --git a/src/transactions/transactions.service.ts b/src/transactions/transactions.service.ts
index 4009571..914559f 100644
--- a/src/transactions/transactions.service.ts
+++ b/src/transactions/transactions.service.ts
@@ -2,5 +2,16 @@ import { Injectable } from '@nestjs/common';
 
 @Injectable()
 export class TransactionsService {
-  //TODO CRUD of transactions
+  //TODO List transaction of a user
+  //TODO List transaction related to a product
+
+  //TODO Transaction for multiple/single products by a user
+    //Check stocks
+    //Check account credit
+      //take the money
+      //Update stock
+      //update history
+      //send response, refurnish if error
+
+  //TODO List all transaction
 }