curl --request POST \
  --url https://api.example.com/api/v1/checkout/sessions \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <x-api-key>' \
  --data '
{
  "plan_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "success_url": "<string>",
  "cancel_url": "<string>",
  "customer_email": "jsmith@example.com",
  "customer_name": "<string>",
  "metadata": {}
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "code": "<string>",
  "checkout_url": "<string>",
  "expires_at": "2023-11-07T05:31:56Z",
  "plan_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "created_at": "2023-11-07T05:31:56Z"
}