feat(Payment): add payment update actions for cart

src/Model/Payment/PaymentReference.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * @author @ct-jensschulze <jens.schulze@commercetools.de>
+ */
+
+namespace Commercetools\Core\Model\Payment;
+
+use Commercetools\Core\Model\Common\Context;
+use Commercetools\Core\Model\Common\Reference;
+
+class PaymentReference extends Reference
+{
+    const TYPE_PAYMENT = 'payment';
+
+    public function fieldDefinitions()
+    {
+        $fields = parent::fieldDefinitions();
+        $fields[static::OBJ] = [static::TYPE => '\Commercetools\Core\Model\Payment\Payment'];
+
+        return $fields;
+    }
+
+    /**
+     * @param $id
+     * @param Context|callable $context
+     * @return PaymentReference
+     */
+    public static function ofId($id, $context = null)
+    {
+        return static::ofTypeAndId(static::TYPE_PAYMENT, $id, $context);
+    }
+}

src/Request/Carts/Command/CartAddPaymentAction.php

@@ -0,0 +1,30 @@
+<?php
+/**
+ * @author @ct-jensschulze <jens.schulze@commercetools.de>
+ */
+
+namespace Commercetools\Core\Request\Carts\Command;
+
+use Commercetools\Core\Model\Common\Context;
+use Commercetools\Core\Request\AbstractAction;
+
+class CartAddPaymentAction extends AbstractAction
+{
+    public function fieldDefinitions()
+    {
+        return [
+            'action' => [static::TYPE => 'string'],
+            'payment' => [static::TYPE => '\Commercetools\Core\Model\Payment\PaymentReference'],
+        ];
+    }
+
+    /**
+     * @param array $data
+     * @param Context|callable $context
+     */
+    public function __construct(array $data = [], $context = null)
+    {
+        parent::__construct($data, $context);
+        $this->setAction('addPayment');
+    }
+}

src/Request/Carts/Command/CartRemovePaymentAction.php

@@ -0,0 +1,30 @@
+<?php
+/**
+ * @author @ct-jensschulze <jens.schulze@commercetools.de>
+ */
+
+namespace Commercetools\Core\Request\Carts\Command;
+
+use Commercetools\Core\Model\Common\Context;
+use Commercetools\Core\Request\AbstractAction;
+
+class CartRemovePaymentAction extends AbstractAction
+{
+    public function fieldDefinitions()
+    {
+        return [
+            'action' => [static::TYPE => 'string'],
+            'payment' => [static::TYPE => '\Commercetools\Core\Model\Payment\PaymentReference'],
+        ];
+    }
+
+    /**
+     * @param array $data
+     * @param Context|callable $context
+     */
+    public function __construct(array $data = [], $context = null)
+    {
+        parent::__construct($data, $context);
+        $this->setAction('removePayment');
+    }
+}