Using the APEX API

Duplicate Check: dupcheck.dc3Api

Using the dupcheck.dc3Api Apex class is as simple as initializing it with a single line:

The dupcheck Apex namespace is included in the managed package when installed in Salesforce.

// Initialize the Duplicate Check API
final dupcheck.dc3Api dc3Api = new dupcheck.dc3Api();

Once initialized, the dc3Api instance provides methods to search, merge, match, validate, and more.
You can find additional information in this documentation.

Record Validation: recordval.RecordValidationAPI_v1

The recordval.RecordValidationAPI_v1 class makes it easy to validate addresses and get geocoding information:

The recordval Apex namespace is included in the managed package when installed in Salesforce.

// Initialize the Record Validation API
final recordval.RecordValidationAPI_v1 api = new recordval.RecordValidationAPI_v1();

Once initialized, the api instance provides methods to validate addresses, email and phone fields from within the Apex code, and more.
See the documentation for more details on address validation and enrichment.