X-API-Key: ********************curl --location --request POST '/billing/checkout' \
--header 'x-workspace;' \
--header 'X-API-Key: <api-key>' \
--header 'Content-Type: application/json' \
--data-raw '{
"planId": "string",
"interval": "month"
}'{
"url": "http://example.com"
}