curl --request GET \
  --url https://api.bkey.id/v1/payment-sessions/{id}

{
  "success": true,
  "paymentSession": {
    "id": "<string>",
    "status": "<string>",
    "approvalUrl": "<string>",
    "amount": 1,
    "currency": "<string>",
    "expiresAt": "2023-11-07T05:31:56Z",
    "merchantName": "<string>",
    "lineItems": [
      {
        "title": "<string>",
        "quantity": 1,
        "price": 1
      }
    ]
  }
}