reproduce.js

// Create an .env file with MOLLIE_APIKEY=YOUR_API_KEY, where YOUR_API_KEY is the api key of your test account
// Run this script with "node reproduce.js"
// Click the payment link in the console, pay for the order using iDeal
// See the error in your browser, and see in the Mollie dashboard that 

const { createMollieClient } = require('@mollie/api-client');
const axios = require('axios');

(async () => {

    require('dotenv').config();

    const apiKey = process.env.MOLLIE_APIKEY;
    const webhookCatcherUrl = "https://pinelab-mollie.requestcatcher.com/test";

    const client = createMollieClient({ apiKey});

    const billingAddress = {
        streetAndNumber: "Cornelist Trooststraat 48",
        postalCode: "8934 CC",
        city: "Leeuwarden",
        country: "NL",
        givenName: "Martijn",
        familyName: "Van de Brug",
        email: "[email protected]",
    };

    const orderLine = {
        name: "Sample product",
        quantity: 1,
        unitPrice: {
            value: "123.45",
            currency: "EUR",
        },
        totalAmount: {
            value: "123.45",
            currency: "EUR",
        },
        vatRate: "21.00",
        vatAmount: {
            value: "21.43",
            currency: "EUR",
        },
    }

    let order = await client.orders.create({
        orderNumber: "ERROR-REPRO",
        amount: {
            value: "123.45",
            currency: "EUR",
        },
        redirectUrl: "https://my.mollie.com/dashboard/org_10091657/orders/",
        webhookUrl: webhookCatcherUrl,
        billingAddress,
        locale: "nl_NL",
        lines: [orderLine],
        metadata: {
            languageCode: "en_EN",
        }
    });
    console.log(`Created order ${order.id}: ${order.getCheckoutUrl()}`);
    // We recreate order lines, to make sure the Mollie order matches our Vendure order when attempting another payment
    // This feature is not part of the Mollie NodeJS client yet, so we have to call the API ourselves
    const {data, status} = await axios({
        url: `https://api.mollie.com/v2/orders/${order.id}/lines`,
        method: 'PATCH',
        headers: {
            'Content-Type': 'application/json',
            Authorization: `Bearer ${apiKey}`,
        },
        data: {
            operations: [
                {
                    operation: 'cancel',
                    data: { id: order.lines[0].id }
                }, 
                {
                    operation: 'add',
                    data: orderLine
                }
            ]
        }


    });
    console.log(`Updated order lines: ${status}`);
})();