https://blog.whmcs.com/133666/the-createssotoken-api-in-whmcs-81
The CreateSsoToken API in WHMCS 8.1 | WHMCS Blog
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https://developers.whmcs.com/api-reference/createssotoken/
CreateSsoToken - WHMCS Developer Documentation
WHMCS developer documentation - themes, modules, hooks, oauth, api and more...
whmcsdeveloperdocumentation