[fix]: Select offer requested amount

app/models/transaction_offers.py

@@ -85,6 +85,13 @@ class TransactionOffer(db.Model):
         return cls.query.filter_by(customer_id=customer_id) \
             .order_by(cls.created_at.desc()) \
             .first()
+    
+    @classmethod
+    def get_transaction_offer(cls, transaction_offer_id):
+        """
+        Returns a transaction offer by its ID.
+        """
+        return cls.query.get(transaction_offer_id)