Plauti Deduplicate offers a REST API which can be used to search or insert/update records in Salesforce via the Data API. 

The dc3DataApi endpoint enables the creation or updating of Salesforce records with built-in duplicate detection. If a duplicate is found, the existing record is updated; if no duplicate is found, a new record is created. The API also supports creating related records within the same request. 

API Documentation

The API documentation can be found in the Plauti SDK.

Authentication

You need to authenticate yourself before you can use the REST API. The authentication works via the standard Salesforce OAuth methods. Read more about this in the REST API Developer Guide.

Other requirements

The user you use to access the Plauti Deduplicate REST API needs to have the Plauti Deduplicate Permission Set in order to use the API.