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the examples I followed the docs and what Ive seen from here in the forums. In fact, I copy and pasted the curl command from a few forum posts, and its how I started to get the 503 error.

Right now, I'm not sure where Im going wrong. I think I'm supplying the mandatory params via CURL, but obviously something is not right.

What docs did you follow? What example shows you the highlighted params below?

-u "<my app key info>:<my secret info>" \
-d "devPhoneNum&password=secretPassword&extension=101&grant_type=password"

that example came from the forums. The docs dont have a curl example to follow

It doesn't matter anymore. You need to change the parameters as shown in my answer!

what is this string in your example:

cmVsLWFsbC1wZXJtaXNzaWXFjMmpRZmlQcnlkSUkweE92QQ==

based64 encoded string of your "app_client_id:app_client_secret"

First off, I really appreciate your patience with me on this matter. Thank you for taking your time to offer some help.

With that said, I'm not sure what I'm doing wrong, but I encoded my app client: app secret info and have this curl command:

curl -X POST "http://service.devtest.ringcentral.com/restapi/oauth/token"; 
-H "Accept: application/json" 
-H "Content-Type: application/x-www-form-urlencoded" 
-u "Authorization: Basic MEI2aEpDX2NTdVdhTTVUT1VfRExZUTo3aFpSNkFtcFJjU2tISFcybi13aUN3WHpQcjFobXpTd2lfdxxxx" 
-d "grant_type=password&username=+1470502XXXX&password=<password>&extension=101"

But I still get the 503 error. Maybe I need to make a new app with different settings?

Encode the plus sign in your username %2B1470502xxx

BTW, you should not post entire phone number and the basic encode string here in public place. I edited your post to hind them this time.

thanks for the heads up about security.

I encoded the username, and i still get the same 503 error. The type of app I created was for the "other none UI (e.g cron job, daemon, command line) so I believe I have the right app type set up.

At this point, I dont know whats going on...

Just double check your curl and found that you use the -u option. Why proxy?

Change it to -H as it is the header

-H "Authorization: Basic MEI2aEpDX2NTdVdhTTVUT1VfRExZUTo3aFpSNkFtcFJjU2tISFcybi13aUN3WHpQcjFobXpTd2lfdxxxx" 

unfortunately, i still get the same results. I dont get why the error I get is "service temporarily unavailable" instead of a specific error that will help me understand where Im going wrong.

this is the cur command Im using:

curl -X POST "http://service.devtest.ringcentral.com/restapi/oauth/token"
 -H "Accept: application/json" -H "Content-Type: application/x-www-form-urlencoded" 
 -H "Authorization: Basic MEI2aEpDX2NTdVdhTTVUT1VfRExZUTo3aFpSNkFtcFJjU2tISFcybi13aUN3WHpQcjFobXpTd2lfdHlXejNTxxxxxxxx" 
 -d "grant_type=password&username=%2B14705020292&password=<password>&extension=101" 

I also sent all the grant type as a header too, no change at all.

Why "http://service.devtest./"?

Do you ever read carefully what I posted?

POST https://platform.devtest.ringcentral.com/restapi/oauth/token

oh, my mistake. I have a text file with your suggestions and the different curl commands I tried. I was editing the wrong command today...Thats embarrassing.

Anyway, I got an auth code now. I really appreciate you putting up with my careless error and helping me through this

I've seen those examples, and how I got my curl command to use. my results are different and Im not sure why. What do you see that Im missing, because I copy and pasted the curl commands others used and Im not getting the same results.

My settings now has the green check mark for "passwords" but auth codes has a red X.
Maybe I need to make a new app and try again? OR maybe Im using the wrong stuff for the settings in my app?