feat: add method to retrieve bank list from API

decide/models/enums.py

@@ -1,5 +1,8 @@
+import requests
 from enum import Enum
 
+BANK_LIST_URL = "https://api.indicina.co/api/v3/banks"
+
 
 class Currency(Enum):
     NGN = "NGN"
@@ -31,6 +34,15 @@ class Bank(Enum):
     UNION = "032"
     ZENITH = "057"
 
+    @classmethod
+    def get_bank_list(cls):
+        response = requests.get(BANK_LIST_URL)
+        if response.status_code == 200:
+            bank_list = response.json()['data']
+            return [(bank['name'], bank['code']) for bank in bank_list]
+        else:
+            raise Exception(f"Failed to get bank list. Status code: {response.status_code}")
+
 
 class StatementType(Enum):
     JSON = "json"