diff --git a/application/donatingService.py b/application/donatingService.py
new file mode 100644
index 0000000..f4d9790
--- /dev/null
+++ b/application/donatingService.py
@@ -0,0 +1,12 @@
+class DonatingService:
+
+    def __init__(self):
+        return self
+
+    def donate_from_user1_to_user2(self, repository: Repository, user1: User, user2: User, amount: float):
+        balance_1 = repository.getBalance(user=user1)
+        balance_2 = repository.getBalance(user=user2)
+        new_balance1 = balance_1 - amount
+        new_balance2 = balance_1 + amount
+        repository.updateBankAccount(user=user1, new_balance=new_balance1)
+        repository.updateBankAccount(user=user2, new_balance=new_balance2)
\ No newline at end of file
diff --git a/application/loaningService.py b/application/loaningService.py
new file mode 100644
index 0000000..e69de29
diff --git a/application/withdrawingService.py b/application/withdrawingService.py
new file mode 100644
index 0000000..b84a682
--- /dev/null
+++ b/application/withdrawingService.py
@@ -0,0 +1,12 @@
+from domain.repository import Repository
+from domain.user import User
+
+class WithdrawingService:
+
+    def __init__(self):
+        return self
+
+    def withdraw_from_user(self, repository: Repository, user: User, amount: float):
+        balance = repository.getBalance(user=user)
+        new_balance = balance - amount
+        repository.updateBankAccount(user=user, new_balance=new_balance)
\ No newline at end of file
diff --git a/domain/bankaccount.py b/domain/bankaccount.py
new file mode 100644
index 0000000..0086c8b
--- /dev/null
+++ b/domain/bankaccount.py
@@ -0,0 +1,14 @@
+from user import User
+
+class BankAccount:
+    _balance: float
+    _user: User
+    def __init__(self, user: User):
+        self._balance = 0
+        self._user = user
+    def getBalance(self):
+        return self._balance
+    def setBalance(self, new_balance: float):
+        self._balance = new_balance
+    def getUser(self):
+        return self._user
\ No newline at end of file
diff --git a/domain/repository.py b/domain/repository.py
new file mode 100644
index 0000000..2998c43
--- /dev/null
+++ b/domain/repository.py
@@ -0,0 +1,24 @@
+from abc import ABC, abstractmethod
+from bankaccount import BankAccount
+from user import User
+
+class Repository(ABC):
+    @abstractmethod
+    def __init__():
+        pass
+
+    @abstractmethod
+    def addBankAccount(self, BankAccount):
+        pass
+    
+    @abstractmethod
+    def getBankAccount(self, user: User):
+        pass
+
+    @abstractmethod
+    def updateBankAccount(self, user: User, new_balance: float):
+        pass
+
+    @abstractmethod
+    def getBalance(self, user: User):
+        pass
\ No newline at end of file
diff --git a/domain/user.py b/domain/user.py
new file mode 100644
index 0000000..5d95e85
--- /dev/null
+++ b/domain/user.py
@@ -0,0 +1,9 @@
+class User:
+    _name: str
+    def __init__(self, name: str):
+        self._name = name
+    def getName(self):
+        return self._name
+    def setName(self, name):
+        self._name = name
+
diff --git a/infrastructure/sqlrepository.py b/infrastructure/sqlrepository.py
new file mode 100644
index 0000000..5d17054
--- /dev/null
+++ b/infrastructure/sqlrepository.py
@@ -0,0 +1,15 @@
+from domain.repository import Repository
+
+class SqLRepository(Repository):
+    
+    def addBankAccount(self, BankAccount):
+        pass
+    
+    def getBankAccount(self, user: User):
+        pass
+
+    def updateBankAccount(self, user: User, new_balance: float):
+        pass
+
+    def getBalance(self, user: User):
+        pass
\ No newline at end of file