add billpay classes and interfaces

src/Payment/Saferpay/Data/Billpay/BillpayPayCompleteParameter.php

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+<?php
+
+namespace Payment\Saferpay\Data\Billpay;
+
+use Payment\Saferpay\Data\AbstractGetSet;
+use Payment\Saferpay\Data\SubBaseInterface;
+
+class BillpayPayCompleteParameter extends AbstractGetSet implements BillpayPayCompleteParameterInterface, SubBaseInterface
+{
+    /**
+     * @param string $popDeplay
+     * @return $this
+     */
+    public function setPobDelay($popDeplay)
+    {
+        $this->set('POB_DELAY', $popDeplay);
+
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getPobDelay()
+    {
+        return $this->get('POB_DELAY');
+    }
+}

src/Payment/Saferpay/Data/Billpay/BillpayPayCompleteParameterInterface.php

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+<?php
+
+namespace Payment\Saferpay\Data\Billpay;
+
+interface BillpayPayCompleteParameterInterface
+{
+    /**
+     * optional, only on buy with invoice
+     * An additional invoice payment delay to the usual 20 or 30 days, default is 0
+     */
+    const POB_DELAY = 'n[..2]';
+
+    /**
+     * @param string $pobDelay
+     * @return $this
+     */
+    public function setPobDelay($pobDelay);
+
+    /**
+     * @return string
+     */
+    public function getPobDelay();
+}

src/Payment/Saferpay/Data/Billpay/BillpayPayCompleteResponse.php

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+<?php
+
+namespace Payment\Saferpay\Data\Billpay;
+
+use Payment\Saferpay\Data\AbstractGetSet;
+use Payment\Saferpay\Data\SubBaseInterface;
+
+class BillpayPayCompleteResponse extends AbstractGetSet implements BillpayPayCompleteResponseInterface, SubBaseInterface
+{
+    /**
+     * @param string $pobDuedate
+     * @return $this
+     */
+    public function setPobDuedate($pobDuedate)
+    {
+        $this->set('POB_DUEDATE', $pobDuedate);
+
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getPobDuedate()
+    {
+        return $this->get('POB_DUEDATE');
+    }
+}

src/Payment/Saferpay/Data/Billpay/BillpayPayCompleteResponseInterface.php

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+<?php
+
+namespace Payment\Saferpay\Data\Billpay;
+
+interface BillpayPayCompleteResponseInterface
+{
+    /**
+     * optional, only on buy with invoice
+     * Defines the date until the customer has to pay the bill
+     * Format: YYYYMMDD
+     */
+    const POB_DUEDATE = 'n[8]';
+
+    /**
+     * @param string $pobDuedate
+     * @return $this
+     */
+    public function setPobDuedate($pobDuedate);
+
+    /**
+     * @return string
+     */
+    public function getPobDuedate();
+}