curl --request POST \
  --url https://billing.funnelfox.com/{org_id}/v1/checkout/update_client_session \
  --header 'Content-Type: application/json' \
  --data '{
  "client_token": "<string>",
  "order_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "pp_ident": "<string>"
}'

{}