Targeting form inputs

I’m looking to use Gravity Forms “After Submission” hook to send the inputted data to a third party server.

Is there a way target the Entry Object Field Values?

add_action( 'gform_after_submission', 'post_to_third_party', 10, 2 );
function post_to_third_party( $entry, $form ) {
    
    $post_url = 'https://thirdparty.com';
    $body = array(
        'first_name' => rgar( $entry, '1.3' ), 
        'last_name' => rgar( $entry, '1.6' ), 
        'message' => rgar( $entry, '3' ),
        );
    GFCommon::log_debug( 'gform_after_submission: body => ' . print_r( $body, true ) );

    $request = new WP_Http();
    $response = $request->post( $post_url, array( 'body' => $body ) );
    GFCommon::log_debug( 'gform_after_submission: response => ' . print_r( $response, true ) );
}