Transaction details - Merchant data

It's possible to add additional data to a transaction object via the details.merchant_data field. This field expects a key-value pair object. Please be aware that the json object can be a maximum of 1024 characters. For example:

    "payment_profile": "7c23a50d-8699-431c-a82b-a78718d2b6f6",
    "amount": 14,
    "customer": "cbbfa6ec-fb44-4da4-94c4-d81e92fd43e6",
    "customer_ip": "",
    "dynamic_descriptor": "orderdesc01",
    "merchant_reference": "my order id",
    "payment_product": "ideal",
    "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/86.0.4240.198 Safari/537.36",
    "details": {
        "redirect_url": "",
        "issuer": "INGBNL2A",
        "merchant_data": {
            "extra": "first field",
            "extra2": "second field",
    "webhook_transaction_update": ""