diff --git a/Api/Payment/Charge.php b/Api/Payment/Charge.php
index e69de29bb..a513ceec9 100644
--- a/Api/Payment/Charge.php
+++ b/Api/Payment/Charge.php
@@ -0,0 +1,27 @@
+<?php
+/**
+ * Karaka
+ *
+ * PHP Version 8.1
+ *
+ * @package   phpOMS\Api\Payment
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://jingga.app
+ */
+declare(strict_types=1);
+
+namespace phpOMS\Api\Payment;
+
+/**
+ * Payment charge.
+ *
+ * @package phpOMS\Api\Payment
+ * @license OMS License 1.0
+ * @link    https://jingga.app
+ * @since   1.0.0
+ */
+final class Charge
+{
+}
diff --git a/Api/Payment/PaymentAbstract.php b/Api/Payment/PaymentAbstract.php
index e69de29bb..9a840db8b 100644
--- a/Api/Payment/PaymentAbstract.php
+++ b/Api/Payment/PaymentAbstract.php
@@ -0,0 +1,157 @@
+<?php
+/**
+ * Karaka
+ *
+ * PHP Version 8.1
+ *
+ * @package   phpOMS\Api\Payment
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://jingga.app
+ */
+declare(strict_types=1);
+
+namespace phpOMS\Api\Payment;
+
+/**
+ * Abstract payment.
+ *
+ * @package phpOMS\Api\Payment
+ * @license OMS License 1.0
+ * @link    https://jingga.app
+ * @since   1.0.0
+ */
+abstract class PaymentAbstract
+{
+        /**
+     * Create/execute a charge
+     *
+     * @param int    $customer Customer id
+     * @param Charge $charge   Charge to execute
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function createCharge(int $customer, Charge $charge) : void;
+
+    /**
+     * Refund a charge
+     *
+     * @param int    $customer Customer id
+     * @param Charge $charge   Charge to execute
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function refundCharge(int $customer, Charge $charge) : void;
+
+    /**
+     * Get all charges of a customer
+     *
+     * @param int       $customer Customer id
+     * @param \DateTime $start    Start date
+     * @param \DateTime $end      End date
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function listCharges(int $customer, \DateTime $start, \DateTime $end) : void;
+
+    /**
+     * Create/add a new payment method
+     *
+     * @param int   $customer      Customer id
+     * @param mixed $paymentMethod Payment method (e.g. cc card)
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function addPaymentMethod(int $customer, mixed $paymentMethod) : void;
+
+    /**
+     * Remove a new payment method
+     *
+     * @param int   $customer      Customer id
+     * @param mixed $paymentMethod Payment method (e.g. cc card)
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function removePaymentMethod(int $customer, mixed $paymentMethod) : void;
+
+    /**
+     * Modify a new payment method
+     *
+     * @param int   $customer      Customer id
+     * @param mixed $paymentMethod Payment method (e.g. cc card)
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function modifyPaymentMethod(int $customer, mixed $paymentMethod) : void;
+
+    /**
+     * Get all payment methods of a customer
+     *
+     * @param int $customer Customer id
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function listPaymentMethods(int $customer) : void;
+
+    /**
+     * Create/add a new subscription
+     *
+     * @param int   $customer     Customer id
+     * @param mixed $subscription Subscription details
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function addSubscription(int $customer, mixed $subscription) : void;
+
+    /**
+     * Remove a new subscription
+     *
+     * @param int   $customer     Customer id
+     * @param mixed $subscription Subscription details
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function removeSubscription(int $customer, mixed $subscription) : void;
+
+    /**
+     * Modify a new subscription
+     *
+     * @param int   $customer     Customer id
+     * @param mixed $subscription Subscription details
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function modifySubscription(int $customer, mixed $subscription) : void;
+
+    /**
+     * Get all subscriptions of a customer
+     *
+     * @param int $customer Customer id
+     *
+     * @return void
+     *
+     * @since 1.0.0
+     */
+    abstract public function listSubscriptions(int $customer) : void;
+}
diff --git a/Api/Payment/PaymentFactory.php b/Api/Payment/PaymentFactory.php
index e69de29bb..8a893242d 100644
--- a/Api/Payment/PaymentFactory.php
+++ b/Api/Payment/PaymentFactory.php
@@ -0,0 +1,27 @@
+<?php
+/**
+ * Karaka
+ *
+ * PHP Version 8.1
+ *
+ * @package   phpOMS\Api\Payment
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://jingga.app
+ */
+declare(strict_types=1);
+
+namespace phpOMS\Api\Payment;
+
+/**
+ * Create a payment.
+ *
+ * @package phpOMS\Api\Payment
+ * @license OMS License 1.0
+ * @link    https://jingga.app
+ * @since   1.0.0
+ */
+final class PaymentFactory
+{
+}
diff --git a/Api/Payment/Stripe.php b/Api/Payment/Stripe.php
index ec2c47dea..5791470b7 100644
--- a/Api/Payment/Stripe.php
+++ b/Api/Payment/Stripe.php
@@ -14,7 +14,7 @@ declare(strict_types=1);
 
 namespace phpOMS\Api\Payment;
 
-use \Stripe\StripeClient;
+use Stripe\StripeClient;
 
 /**
  * Strip generator.
@@ -26,24 +26,75 @@ use \Stripe\StripeClient;
  */
 final class Stripe extends PaymentAbstract
 {
-    private Stripe\StripeClient $con;
+    private \Stripe\StripeClient $con;
 
+    /**
+     * Constructor.
+     *
+     * @param string $apiKey Api key
+     *
+     * @since 1.0.0
+     */
     public function __construct(string $apiKey)
     {
         $this->con = new \Stripe\StripeClient($apiKey);
     }
 
-    public function createCharge(int $customer, Charge $charge) {}
-    public function refundCharge(int $customer, int $charge) {}
-    public function listCharges(int $customer) {}
+    /**
+     * {@inheritdoc}
+     */
+    public function createCharge(int $customer, Charge $charge) : void {}
 
-    public function addPaymentMethod(int $customer, mixed $paymentMethod) {}
-    public function removePaymentMethod(int $customer, int $paymentMethod) {}
-    public function modifyPaymentMethod(int $customer, mixed $paymentMethod) {}
-    public function listPaymentMethods(int $customer) {}
+    /**
+     * {@inheritdoc}
+     */
+    public function refundCharge(int $customer, Charge $charge) : void {}
 
-    public function addSubscription(int $customer, mixed $subscription) {}
-    public function removeSubscription(int $customer, int $subscription) {}
-    public function modifySubscription(int $customer, mixed $subscription) {}
-    public function listSubscriptions(int $customer) {}
+    /**
+     * {@inheritdoc}
+     */
+    public function listCharges(int $customer, \DateTime $start, \DateTime $end) : void {}
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addPaymentMethod(int $customer, mixed $paymentMethod) : void
+    {
+        $this->con->paymentMethods->attach();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removePaymentMethod(int $customer, mixed $paymentMethod) : void {}
+
+    /**
+     * {@inheritdoc}
+     */
+    public function modifyPaymentMethod(int $customer, mixed $paymentMethod) : void {}
+
+    /**
+     * {@inheritdoc}
+     */
+    public function listPaymentMethods(int $customer) : void {}
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addSubscription(int $customer, mixed $subscription) : void {}
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removeSubscription(int $customer, mixed $subscription) : void {}
+
+    /**
+     * {@inheritdoc}
+     */
+    public function modifySubscription(int $customer, mixed $subscription) : void {}
+
+    /**
+     * {@inheritdoc}
+     */
+    public function listSubscriptions(int $customer) : void {}
 }