FuseWP OAuth Broker
The hosted OAuth authorization broker FuseWP operates at auth.fusewp.com. The self-hosted FuseWP plugin cannot safely hold OAuth client secrets for the partner platforms it connects to, so it delegates the authorization-code and refresh-token exchange to this service. GET /{integration_id} (with fwpnonce and redirect_url query parameters) issues a 302 to the partner platform's own authorize endpoint carrying FuseWP's registered client_id, the auth.fusewp.com redirect_uri and the delegated scope set; GET /{integration_id}?refresh_token={token} returns a JSON body with a boolean `success` field plus refreshed credentials. Eleven integration ids resolve to a live 302 as probed on 2026-08-12: aweber, birdsend, campaignmonitor, constantcontact, copper, gohl (GoHighLevel), hubspot, keap, mailchimp, zohocrm and zohocampaigns. The service publishes no OpenAPI, no developer documentation and no /.well-known/ discovery surface; the contract recorded here was derived from the GPL-licensed first-party plugin source (src/core/src/Integrations/AbstractIntegration.php) and confirmed by live probe.