Integration from Salesforce to send contacts to Zoho CRM

Integration from Salesforce to send contacts to Zoho CRM

How can I do the following WITHOUT using a tool (i.e. how can I use apex code to send to zoho crm?) I know how to do REST Callouts in Apex/Salesforce but not sure how to integrate with the Zoho CRM API?

Create an integration in salesforce that will send contacts to Zoho CRM.