curl --request PATCH \
  --url https://merchant-demo.zahlo.eu/api/v1/subscriptions/{id} \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "customerId": "cus_demo_1001",
  "priceId": "price_demo_1001"
}
'

import requests

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

payload = {
    "customerId": "cus_demo_1001",
    "priceId": "price_demo_1001"
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({customerId: 'cus_demo_1001', priceId: 'price_demo_1001'})
};

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

{
  "id": "sub_demo_1001",
  "customerId": "cus_demo_1001",
  "priceId": "price_demo_1001",
  "status": "active"
}

{
  "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"
}