ProcessMaker Forum | BPM Workflow Simplified

I am trying to connect to ProcessMaker using REST API calls via Ruby. I can generate the appropriate requests and test those requests via the Advanced Rest Client. I am using a call to OAuth to get a token that will be used to access data in the database. Whenever I post it get :

"error":"invalid_request","error_description":"The grant type was not specified in the request"

You are not setting your grant_type or scope correctly when obtaining your access token. You need to send this information to obtain the token:

This is the body of the post:

{"grant_type":"password","scope":"*","client_id":"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX","client_secret":"YYYYYYYYYYYYYYYYYYYYYYYYY","username":"admin","password":"admin"}

Using this same data in the Advanced REST Client is successful. Perhaps it is an issue with how Ruby is formating the post data.

You need to set your content-type to application/json in the header when requesting the access token and you need to send the request as POST.

Here is the information from debugging my calls to the OAuth page:

[2017-05-10 21:22:42.165] DEBUG Sending post request to http://XX.XX.XXX.XXX:8080/workflow/oauth2/token with body: {"grant_type":"password","scope":"*","client_id":"ORFAVREOUWRAUGGRQJGTNKDRHKBSETWT","client_secret":"434157704590a695188bf57026369405","username":"pwaller","password":"welcome"} and headers:
http://52.39.212.230:8080/workflow/oauth2/token

{"grant_type":"password","scope":"*","client_id":"ORFAVREOUWRAUGGRQJGTNKDRHKBSETWT","client_secret":"434157704590a695188bf57026369405","username":"pwaller","password":"welcome"}
[2017-05-10 21:22:42.303] INFO POST http://52.39.212.230:8080/workflow/oauth2/token -- (0.13s) 400 {"error":"invalid_client","error_description":"The client credentials are invalid"} {"date"=>"Wed, 10 May 2017 21:22:42 GMT", "server"=>"Apache/2.4.6 (CentOS) PHP/5.4.16", "x-powered-by"=>"PHP/5.4.16", "access-control-allow-origin"=>"*", "vary"=>"Accept", "cache-control"=>"no-store", "content-length"=>"83", "connection"=>"close", "content-type"=>"application/json"}

It appears to me that the content-type is set to application/json and the body is valid json, includes the grant_type. The user id and password are valid and can log into ProcessMaker. The user is an Administrator.

Any ideas would be appreciated.

I have no clue why it isn't working. You might try using another library, like this one:
https://github.com/rest-client/rest-cli ... /README.md

According to its README.md file, you can use this: