Various code clean up.

app/Repositories/Account/AccountRepository.php

@@ -496,7 +496,7 @@ class AccountRepository implements AccountRepositoryInterface
     }
 
     /**
-     * @param string $iban
+     * @param null|string $iban
      *
      * @return null|string
      */

app/Repositories/Journal/CreateJournalsTrait.php

@@ -32,7 +32,14 @@ use Log;
  */
 trait CreateJournalsTrait
 {
-
+    /**
+     * @param User            $user
+     * @param TransactionType $type
+     * @param array           $data
+     *
+     * @return array
+     */
+    abstract public function storeAccounts(User $user, TransactionType $type, array $data): array;
 
     /**
      *