Is now capable of updating transactions over the API.

app/Support/Binder/TransactionGroup.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * TransactionGroup.php
+ * Copyright (c) 2019 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+declare(strict_types=1);
+
+namespace FireflyIII\Support\Binder;
+
+use FireflyIII\Models\TransactionJournal;
+use Illuminate\Routing\Route;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+/**
+ * Class TransactionGroup.
+ */
+class TransactionGroup implements BinderInterface
+{
+    /**
+     * @param string   $value
+     * @param    Route $route
+     *
+     * @return TransactionGroup
+     * @throws NotFoundHttpException
+     */
+    public static function routeBinder(string $value, Route $route): TransactionGroup
+    {
+        if (auth()->check()) {
+            $group = auth()->user()->transactionGroups()
+                ->find($value);
+            if (null !== $group) {
+                return $group;
+            }
+        }
+
+        throw new NotFoundHttpException;
+    }
+}

app/Support/Import/Placeholder/ImportTransaction.php

@@ -195,8 +195,8 @@ class ImportTransaction
             return;
         }
 
-        $modifiers = ['rabo-debit-credit', 'ing-debit-credit'];
-        if (\in_array($role, $modifiers, true)) {
+        $modifiers = ['generic-debit-credit'];
+        if (in_array($role, $modifiers, true)) {
             $this->modifiers[$role] = $columnValue->getValue();
 
             return;