curl --request POST \
  --url https://merchant-demo.zahlo.eu/api/v1/disputes/{id}/respond \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "evidence": {
    "defenseReasonCode": "GoodsOrServicesProvided",
    "documents": [
      {
        "defenseDocumentTypeCode": "DeliveryConfirmation",
        "fileName": "delivery.pdf",
        "contentType": "application/pdf",
        "contentBase64": "JVBERi0xLjQK"
      }
    ]
  }
}
'

import requests

url = "https://merchant-demo.zahlo.eu/api/v1/disputes/{id}/respond"

payload = { "evidence": {
        "defenseReasonCode": "GoodsOrServicesProvided",
        "documents": [
            {
                "defenseDocumentTypeCode": "DeliveryConfirmation",
                "fileName": "delivery.pdf",
                "contentType": "application/pdf",
                "contentBase64": "JVBERi0xLjQK"
            }
        ]
    } }
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    evidence: {
      defenseReasonCode: 'GoodsOrServicesProvided',
      documents: [
        {
          defenseDocumentTypeCode: 'DeliveryConfirmation',
          fileName: 'delivery.pdf',
          contentType: 'application/pdf',
          contentBase64: 'JVBERi0xLjQK'
        }
      ]
    }
  })
};

fetch('https://merchant-demo.zahlo.eu/api/v1/disputes/{id}/respond', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "id": "PSP-DEMO-1001",
  "paymentId": "pay_demo_1001",
  "status": "needs_response",
  "amount": {
    "amountMinor": 4990,
    "currency": "EUR"
  },
  "reason": "Goods not received",
  "evidenceDueAt": "2026-08-05T00:00:00"
}

{
  "error": "invalid_request",
  "message": "amountMinor must be positive",
  "requestId": "req_demo_1001"
}

{
  "error": "invalid_request",
  "message": "amountMinor must be positive",
  "requestId": "req_demo_1001"
}

{
  "error": "invalid_request",
  "message": "amountMinor must be positive",
  "requestId": "req_demo_1001"
}

{
  "error": "invalid_request",
  "message": "amountMinor must be positive",
  "requestId": "req_demo_1001"
}