Added support for interest history

src/cryptocom/exchange/private.py

@@ -6,7 +6,7 @@ from .api import ApiProvider, ApiError
 from .market import Exchange
 from .structs import (
     Pair, OrderSide, OrderStatus, OrderType, Order, Coin, Balance,
-    OrderExecType, OrderForceType, PrivateTrade
+    OrderExecType, OrderForceType, PrivateTrade, Interest
 )
 
 
@@ -36,6 +36,24 @@ class Account:
             for bal in data['accounts']
         }
 
+    async def get_interest_history(
+            self, currency: str, start_ts: int, end_ts: int, page: int = 0, page_size: int = 20) -> List[Interest]:
+        """Return all history interest."""
+        params = {'page_size': page_size, 'page': page}
+        if currency:
+            params['currency'] = currency
+        if start_ts:
+            params['start_ts'] = start_ts
+        if end_ts:
+            params['end_ts'] = end_ts
+
+        data = await self.api.post(
+            'private/margin/get-order-history', {'params': params}) or {}
+        return [
+            Interest.create_from_api(interest)
+            for interest in data.get('list') or []
+        ]
+
     async def get_orders_history(
             self, pair: Pair = None, page: int = 0,
             page_size: int = 200) -> List[Order]:

src/cryptocom/exchange/structs.py

@@ -339,3 +339,22 @@ class Order:
             trigger_price=trigger_price,
             trades=trades
         )
+
+
+@dataclass
+class Interest:
+    loan_id: int
+    currency: str
+    interest: float
+    stake_amount: float
+    interest_rate: float
+
+    @staticmethod
+    def create_from_api(cls, data: Dict) -> 'Interest':
+        return cls(
+            loan_id=int(data['loan_id']),
+            currency=data['currency'],
+            interest=float(data['interest']),
+            stake_amount=float(data['stake_amount']),
+            interest_rate=float(data['interest_rate'])
+        )