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Mahesh MahawarMahesh Mahawar 

The REST API is not enabled for this Organization:API_DISABLED_FOR_ORG

Hi Team,
I have created an Trial Account of Salesforce and Developer.
I got success to login and got access_token .but when i try to create new Case ,getting error  [{"message":"The REST API is not enabled for this Organization.","errorCode":"API_DISABLED_FOR_ORG"}]. Please let me know ,what is miss to configure in my trial account.
 
JyothsnaJyothsna (Salesforce Developers) 
Hi Mahesh,
You are using Trail Edition (i.e. Professional Edition). API is not enabled by default for the Trail Edition. Please use Developer Edition                              ( https://developer.salesforce.com/signup). Trial Edition expires after 30 days, but DE account doesn't expire.

To use the API, your organization must be on one of the following four editions.  Note that this feature is enabled by default:

1. Enterprise Edition
2. Unlimited Edition
3. Developer Edition
4. Performance Edition

The API is not available by default for the following editions:

1. Contact Edition
2. Group Edition
3. Professional Edition

Note: Professional and Group Edition may have the API temporarily turned on by contacting their Account Executive.  Professional can also purchase the API as a feature by contacting their Account Executive.

Please check the below link for more information

https://help.salesforce.com/apex/HTViewSolution?urlname=Enabling-API&language=en_US

Hope this helps you!

Please mark it as best answer if it really helpful.
Best Regards,
Jyothsna