curl --request POST \
  --url http://localhost:3001/api/v1/elements/session \
  --header 'Content-Type: application/json' \
  --data '
{
  "publishableKey": "pk_test_01HXYZ",
  "amount": 25.5,
  "currency": "usd"
}
'

{
  "success": true,
  "data": {
    "id": "<string>",
    "expiresInSeconds": 123
  }
}