curl --request POST \
  --url https://api.pramaan.dev/v1/capabilities/billing.transaction-item.get \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "transactionItemId": "101"
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({transactionItemId: '101'})
};

fetch('https://api.pramaan.dev/v1/capabilities/billing.transaction-item.get', 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.transaction-item.get"

payload = { "transactionItemId": "101" }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "transactionItemId": "<string>",
  "transactionId": "<string>",
  "productId": "<string>",
  "variantId": "<string>",
  "unitPrice": {
    "amount": 123,
    "currency": "<string>"
  },
  "quantity": 123,
  "productName": "<string>",
  "variantName": "<string>",
  "createdAt": "<string>",
  "updatedAt": "<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>"
      }
    ]
  }
}