In order to set up the integration, you will need to be a Contract Manager in Salesforce.
Salesforce Editions
You must have REST API enabled to authenticate your Salesforce.
Access enabled by default:
Enterprise Edition
Unlimited Edition
Developer Edition
Performance Edition
Editions where you can purchase API access:
Professional Edition
Editions where you cannot purchase API access:
Group Edition
Essentials Edition
For additional information on API compatible editions and development environments, please take a look at Tray.io Connectors and Salesforce REST API Developer Guide.