curl --request POST \
  --url https://api.sandbox.henrylabs.ai/v0/cart/checkout \
  --header 'x-api-key: <api-key>' \
  --header 'x-user-id: <x-user-id>'

{
  "success": true,
  "status": "<string>",
  "message": "<string>",
  "data": {
    "checkout_url": "<string>"
  }
}