diff --git a/src/common/enums/money-type.enum.ts b/src/common/enums/money-type.enum.ts
new file mode 100644
index 0000000..5811cca
--- /dev/null
+++ b/src/common/enums/money-type.enum.ts
@@ -0,0 +1,6 @@
+export enum MoneyType {
+    money = 'money',
+    retailCC = 'retailCC',
+    carbonCredit = 'carbonCredit',
+  }
+  
\ No newline at end of file
diff --git a/src/users/dto/add-money.dto.ts b/src/users/dto/add-money.dto.ts
new file mode 100644
index 0000000..0d6e5b0
--- /dev/null
+++ b/src/users/dto/add-money.dto.ts
@@ -0,0 +1,20 @@
+import { IsNotEmpty, IsNumber, IsEnum } from 'class-validator';
+import { ApiProperty } from '@nestjs/swagger';
+import { MoneyType } from '@/common/enums/money-type.enum';
+export class AddMoneyDto {
+  @ApiProperty({
+    description: 'Quantity',
+    example: 20,
+  })
+  @IsNotEmpty()
+  @IsNumber()
+  quantity: number;
+
+  @ApiProperty({
+    description: 'Option',
+    example: MoneyType.carbonCredit,
+  })
+  @IsNotEmpty()
+  @IsEnum(MoneyType)
+  option: MoneyType;
+}
diff --git a/src/users/users.controller.ts b/src/users/users.controller.ts
index 5f6aa27..46fdc3a 100644
--- a/src/users/users.controller.ts
+++ b/src/users/users.controller.ts
@@ -8,7 +8,8 @@ import { Role } from '@/common/enums/role.enum';
 import { Roles } from '@/common/decorators/roles.decorator';
 
 import { UsersService } from './users.service';
-
+import { Patch, Param, Body } from '@nestjs/common';
+import { AddMoneyDto } from './dto/add-money.dto';
 @ApiTags('Users')
 @ApiBearerAuth()
 @UseGuards(JwtGuard)
@@ -28,6 +29,22 @@ export class UsersController {
     };
   }
 
+
+  @Patch(':id/add-money')
+  @UseGuards(JwtGuard, RolesGuard)
+  @Roles(Role.User, Role.Provider, Role.Admin) //for dev
+  buyCarbon(
+  @Param('id') id: string,
+  @Body() addMoneyDto: AddMoneyDto,
+  @GetUser() user) 
+  {
+    const addMoney = this.usersService.addMoney(id,addMoneyDto, user);
+    return {
+      message: 'success',
+      data: addMoney
+    }
+  }
+
   @Get()
   @UseGuards(RolesGuard)
   @Roles(Role.Admin)
diff --git a/src/users/users.service.ts b/src/users/users.service.ts
index 164c4bf..04e44fc 100644
--- a/src/users/users.service.ts
+++ b/src/users/users.service.ts
@@ -3,7 +3,7 @@ import { Injectable, HttpException } from '@nestjs/common';
 import { InjectModel } from '@nestjs/mongoose';
 import { Model } from 'mongoose';
 import { User, UserDocument } from '@/users/schemas/user.schema';
-
+import { AddMoneyDto } from '@/users/dto/add-money.dto';
 @Injectable()
 export class UsersService {
   constructor(
@@ -68,4 +68,40 @@ export class UsersService {
   async findAll(): Promise<UserDocument[]> {
     return await this.userModel.find().select('-__v -password').exec();
   }
+
+  async addMoney(id: string, addMoneyDto: AddMoneyDto,user) {
+    const moneyType = addMoneyDto.option;
+    const quantity = addMoneyDto.quantity;
+    if(quantity < 0){
+      throw new HttpException(
+        {
+          success: false,
+          message: 'Quantity must be positive',
+        },
+        400,
+      );
+    }
+    const userExists = await this.findOneById(id);
+    if (!userExists) {
+      throw new HttpException(
+        {
+          success: false,
+          message: 'User not found',
+        },
+        404,
+      );
+    }
+    if (moneyType === 'carbonCredit') {
+      userExists.carbonCredit += quantity;
+    }
+    if (moneyType === 'money') {
+      userExists.money += quantity;
+    }
+    if (moneyType === 'retailCC') {
+      userExists.retailCC += quantity;
+    }
+    userExists.save();
+    return userExists;
+  }
+
 }