+/**
+ * \brief Checks the validity of a pin against a username
+ * \param AcctID Account ID
+ * \param Pin Integer version of the pin
+ * \return Boolean correct
+ */
+extern int Bank_IsPinValid(int AcctID, int Pin);
+
+/**
+ * \brief Update a user's pin
+ * \param AcctID Account ID
+ * \param NewPin New pin for the account
+ */
+extern void Bank_SetPin(int AcctID, int NewPin);
+