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<?php
/**
 * Gravity Wiz // Gravity Forms // Remove query args from Save & Continue's "resume url".
 *
 * If form is access from the url:
 *
 * http://mysite.com/form-page/?boom=1
 *
 * Reume URL would be:
 *
 * http://mysite.com/form-page/
 *
 */
add_filter( 'gform_save_and_continue_resume_url', function( $resume_url, $form, $token, $email ) {
            
    // remove specific query arg
    //$resume_url = remove_query_arg( array( 'boom' ), $resume_url );

    // remove ALL query args
    $resume_url = add_query_arg( array( 'gf_token' => $token ), array_shift( explode( '?', $resume_url ) ) );

    return $resume_url;
}, 10, 4 );