Free App support CI/CD

I'm mendix starter.When I learning how to Implement a Simple CICD Pipeline with Mendix APIs in Mendix doc. I could not find Node Permissions setting use a free App.  I try rest api request [] to get version info,  but returned no authenticated.I guess  default Node Permissions is disabled . Does Free App support Mendix API or Should I buy a lincense for CI/CD ?  
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