Add return types in transactions docstrings

handler/transactions.py

@@ -38,6 +38,8 @@ class Transactions(object):
     def transaction(self, data):
         """
         Store details of transaction.
+        :param data: details of transaction
+        :type data: dict
         """
         event = data["event"]
         ts = data["timestamp"]
@@ -79,6 +81,8 @@ class Transactions(object):
         Find transactions that match the given reference and amount.
         :param reference: transaction reference in Revolut
         :param amount: transaction amount
+        :type reference: string
+        :type amount: int
         :return: transaction details or AMOUNT_INVALID, or False
         """
         all_transactions = r.scan(0, match="tx.*")