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This module is currently broken. I think it was made with version 1 of the Mollie API in mind. If you use it together with the current version of the Mollie API (v2), it does not work at all. Here's a discription of the API changes from v1 to v2 that I think the developer of this module may want to take a look at.

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I ran into this issue too. I edited the Mollie module to fit my own needs, a bit too many changes to create a merge request, but it deals with this issue. 


<?php namespace ProcessWire;

// Here you can find more information about the Mollie php api https://github.com/mollie/mollie-api-php

require_once __DIR__ . "/vendor/autoload.php";

class PaymentMollie extends PaymentModule

    public static function getModuleInfo()
        return [
            'title' => 'PaymentMollie',
            'version' => '0.0.2',
            'summary' => 'Mollie Payment method',
            'singular' => false,
            'autoload' => false,
            'requires' => 'ProcessWire>=3.0.98, PaymentModule',

    public function init()
        ini_set('display_errors', 1);
        ini_set('display_startup_errors', 1);

    public function getTitle()
        return $this->_("Mollie: iDeal, Bancontact");

    public function getFailureReason()
        return "Error";

    public function processPayment()
        $payment_id = wire()->input->post->id;
        $order_id = wire()->input->urlSegment2;

        $mollie = new \Mollie\Api\MollieApiClient();

        if ($this->live_check == "1") {

        $payment = $mollie->payments->get($payment_id);
        $order_id = $payment->metadata->order_id;

        wire()->log->save("mollie", "Processing payment for... $order_id");

        if ($payment->isPaid() == true) {

            wire()->log->save("mollie", "Order $order_id was paid using mollie!");

            $order = wire()->pages->get($order_id);
            $order->pad_paid = time();
            $order->addNote($this->_("Order paid using Mollie") . ": " . $payment->id);

            return true;
        } elseif ($payment->isOpen() == FALSE) {
            return false;
        return false;

    public function getMollieMethods()
        $mollie = new \Mollie\Api\MollieApiClient();

        if ($this->live_check == "1") {

        $methods = $mollie->methods->all();
        $return = [


        foreach ($methods as $method) {
            $return[] = [
                "title" => htmlspecialchars($method->description),
                "icon" => htmlspecialchars($method->image->size1x),
                "icon2x" => htmlspecialchars($method->image->size2x),

        return $return;

    public function render()
        $output = "";

        $mollie = new \Mollie\Api\MollieApiClient();

        if ($this->live_check == "1") {

        $paymentInfo = [
            "amount"   => [
                    "value" => number_format(($this->getTotalAmount() /100), 2, '.', ''),
                    "currency" => 'EUR',
            "description" => "Bestelling van: " . $this->customer->givenName . " " . $this->customer->familyName,
            "redirectUrl" => $this->httphost . "checkout/?id=" . $this->id,
            "webhookUrl"  => $this->httphost. "checkout/processmollie/" . $this->id . "/",

            // Specify here wat you want
            "metadata" => [
                "order_id" => $this->id,
                    "customer_name" => $this->customer->givenName,
                    "customer_familyName" => $this->customer->familyName,
                    "customer_address" => $this->customer->streetAddress,
                    "customer_locality" => $this->customer->locality,
                    "customer_postalCode" => $this->customer->postalCode,
                    "customer_country" => $this->customer->country,
                    "customer_email" => $this->customer->email

        // $output .= "<pre>" . print_r($paymentInfo, true) . "</pre>";

        $payment = $mollie->payments->create($paymentInfo);

        wire()->log->save("mollie", "Creating the payment... $order_id");

        // Type here your custom HTML
        // use $payment->getPaymentUrl() as url for your payment link

        foreach ($methods as $method) {
            $output .= '<div style="line-height:40px; vertical-align:top">';
            $output .= '<img src="' . htmlspecialchars($method->image->size1x) . '" srcset="' . htmlspecialchars($method->image->size2x) . ' 2x"> ';
            $output .= htmlspecialchars($method->description) . ' (' . htmlspecialchars($method->id) . ')';
            $output .= '</div>';
        $output .= "</div>";

        $output  .= "<div><form action='{$payment->getCheckoutUrl()}'>
            <button type='submit'>". __('Pay') ."</button></form></div>";

        return $output;

    public static function getModuleConfigInputfields(array $data)
        $inputfields = new InputfieldWrapper();

        // Test API
        $live_api_field = wire('modules')->get('InputfieldText');
        $live_api_field->name = 'test_api_key';
        $live_api_field->label = __("Test API Key");
        $live_api_field->notes = __("");
        if (isset($data['test_api_key'])) {
            $live_api_field->value = $data['test_api_key'];


        // Live API
        $test_api_field = wire('modules')->get('InputfieldText');
        $test_api_field->name = 'api_key';
        $test_api_field->label = __("Live API Key");
        $test_api_field->notes = __("");
        if (isset($data['api_key'])) {
            $test_api_field->value = $data['api_key'];


        // Select live or test API
        $check_api_field = wire('modules')->get('InputfieldCheckbox');
        $check_api_field->name = 'live_check';
        $check_api_field->checked = $data['live_check'];
        $check_api_field->label = __("Use Live API Key");
        $check_api_field->notes = __("If not selected, the test-api will be used. Keep in mind that you also have to activate the Live api on your Mollie dashboard");
        if (isset($data['live_check'])) {
            $check_api_field->value = $data['live_check'];


        // HTTP Host url
        $httphost_field = wire('modules')->get('InputfieldURL');
        $httphost_field->name = 'httphost';
        $httphost_field->label = __("HTTP Host");
        $httphost_field->notes = __("");
        if (isset($data['httphost'])) {
            $httphost_field->value = $data['httphost'];


        return $inputfields;


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