To connect to ADP, you can use either a DSN or an ODBC connection string. Both of these methods use the odbc_connect function.

Connect to a DSN

To connect using a DSN:

$cnx = odbc_connect("CData ADP Sys", "", "");

Provide a Driver Connection String

To connect using an ODBC connection string:

$cnx = odbc_connect("DRIVER={CData ODBC Driver for ADP};OAuthClientId=YourClientId;OAuthClientSecret=YourClientSecret;SSLClientCert='c:\\cert.pfx';SSLClientCertPassword='admin@123'", "", "");