Some basic code for liability accounts.

app/Repositories/Account/AccountRepositoryInterface.php

@@ -123,6 +123,13 @@ interface AccountRepositoryInterface
      */
     public function getCashAccount(): Account;
 
+    /**
+     * @param $account
+     *
+     * @return string
+     */
+    public function getInterestPerDay(Account $account): string;
+
     /**
      * Return meta value for account. Null if not found.
      *
@@ -151,7 +158,6 @@ interface AccountRepositoryInterface
      */
     public function getOpeningBalanceAmount(Account $account): ?string;
 
-
     /**
      * Return date of opening balance as string or null.
      *
@@ -170,6 +176,31 @@ interface AccountRepositoryInterface
      */
     public function getReconciliation(Account $account): ?Account;
 
+    /**
+     * @param Account $account
+     *
+     * @return bool
+     */
+    public function isLiability(Account $account): bool;
+
+    /**
+     * Returns the date of the very first transaction in this account.
+     *
+     * @param Account $account
+     *
+     * @return TransactionJournal|null
+     */
+    public function latestJournal(Account $account): ?TransactionJournal;
+
+    /**
+     * Returns the date of the very last transaction in this account.
+     *
+     * @param Account $account
+     *
+     * @return Carbon|null
+     */
+    public function latestJournalDate(Account $account): ?Carbon;
+
     /**
      * Returns the date of the very first transaction in this account.
      *