curl --request POST \
  --url https://api.pramaan.dev/v1/capabilities/billing.subscription.cancel \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --data '
{
  "subscriptionId": "sub_example",
  "when": "period_end"
}
'

const options = {
  method: 'POST',
  headers: {
    'Idempotency-Key': '<idempotency-key>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({subscriptionId: 'sub_example', when: 'period_end'})
};

fetch('https://api.pramaan.dev/v1/capabilities/billing.subscription.cancel', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.pramaan.dev/v1/capabilities/billing.subscription.cancel"

payload = {
    "subscriptionId": "sub_example",
    "when": "period_end"
}
headers = {
    "Idempotency-Key": "<idempotency-key>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "subscriptionId": "<string>",
  "status": "active",
  "customerId": "<string>",
  "recurringAmount": {
    "amount": 123,
    "currency": "<string>"
  },
  "interval": "day",
  "intervalCount": 123,
  "quantity": 123,
  "cancelAtPeriodEnd": true,
  "currentPeriodEnd": "<string>",
  "nextBillingAt": "<string>",
  "canceledAt": "<string>",
  "createdAt": "<string>"
}

{
  "error": {
    "code": "addendum_required",
    "message": "<string>",
    "next": "<string>",
    "request_id": "<string>",
    "retryable": true,
    "effect": "none",
    "slot": "<string>",
    "required_micro": 123,
    "reason": "balance",
    "plan": "<string>",
    "needs": [
      {
        "kind": "approval",
        "detail": "<string>",
        "step": "<string>"
      }
    ]
  }
}