API: Add some missing end points

api/v1/payments/create.php

@@ -0,0 +1,30 @@
+<?php
+
+require_once '../validate_api_key.php';
+
+require_once '../require_post_method.php';
+
+// Payments require All Clients scope
+$insert_id = false;
+
+if ($client_id == 0) {
+
+    $payment_row = false; // Creation, not an update
+    require_once 'payment_model.php';
+
+    if (!empty($invoice_id) && !empty($amount)) {
+
+        $insert_sql = mysqli_query($mysqli, "INSERT INTO payments SET payment_invoice_id = $invoice_id, payment_amount = $amount, payment_date = '$date', payment_method = '$method', payment_reference = '$reference', payment_notes = '$notes'");
+
+        if ($insert_sql) {
+            $insert_id = mysqli_insert_id($mysqli);
+
+            // Logging
+            logAction("Payment", "Create", "Created payment for invoice $invoice_id via API ($api_key_name)", 0, $insert_id);
+            logAction("API", "Success", "Created payment for invoice $invoice_id via API ($api_key_name)", 0);
+        }
+    }
+}
+
+// Output
+require_once '../create_output.php';