API: Add some missing end points

api/v1/invoices/delete.php

@@ -0,0 +1,31 @@
+<?php
+
+require_once '../validate_api_key.php';
+
+require_once '../require_post_method.php';
+
+// Parse ID
+$invoice_id = intval($_POST['invoice_id']);
+
+// Default
+$delete_count = false;
+
+if (!empty($invoice_id)) {
+    $row = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT * FROM invoices WHERE invoice_id = $invoice_id AND invoice_client_id LIKE '$client_id' LIMIT 1"));
+    $invoice_exists = $row['invoice_id'];
+
+    $delete_sql = mysqli_query($mysqli, "DELETE FROM invoices WHERE invoice_id = $invoice_id AND invoice_client_id LIKE '$client_id' LIMIT 1");
+
+    if ($delete_sql && !empty($invoice_exists)) {
+        $delete_count = mysqli_affected_rows($mysqli);
+
+        // Also delete invoice items
+        mysqli_query($mysqli, "DELETE FROM invoice_items WHERE invoice_item_invoice_id = $invoice_id");
+
+        // Logging
+        logAction("Invoice", "Delete", "Invoice $invoice_id via API ($api_key_name)", $client_id);
+    }
+}
+
+// Output
+require_once '../delete_output.php';