<?php
//After Submission hook & function
add_action("gform_after_submission", "after_submission", 10, 2);

function after_submission($entry, $form){

  //For this example, i was creating a simple post (of course it can be used for anything from complex woocommerce production creation to user registration.

  $my_post = array(
    'post_title'    => wp_strip_all_tags( 'test' ),
    'post_content'  => 'Test',
    'post_status'   => 'publish'
  );

  // Insert the post into the database
  $post_id = wp_insert_post( $my_post );

  //First define the Form ID and Post Meta Title.
  $fieldID = 2; //Gravity Forms Field ID
  $fieldName = 'checkbox-test'; //Wp-Types field slug
  //Now pass all 5 parameters to the checkbox function ($form & $entry are defined in this hook)
  gform_wpcf_checkbox_selector($post_id, $form, $fieldID, $entry, $fieldName);

}

/**
 * GravityFroms to WP-Types selector
 */

 function gform_wpcf_checkbox_selector($post_id = '', $form = '', $fieldID = '', $entry = '', $wpcf_field = ''){

  //if any values not passed, abort
  if ($post_id == '' || $form == '' || $fieldID == '' || $entry == '' || $entry == '') {
   return;
  }

  //Get array of Checkbox Names and Field IDs
  foreach ($form['fields'] as $key => $value) {
    //Loop through fields and look for fieldID
    if ($value['id'] == $fieldID) {
      //once we locate the correct field, create a new array of the values held.
      $gormFields = $form['fields'][$key]['inputs'];
    }
  }

  //Get WP-Types field details and set blank $options array (holds the selected values for updating)
  require_once WPCF_EMBEDDED_INC_ABSPATH . '/fields.php';
  $fieldData = wpcf_admin_fields_get_field($wpcf_field);
  $options = array();

  //loop through the options in the wpcf-field array
  foreach ($fieldData['data']['options'] as $key => $checkboxField) {
    //while looping through gformFields array for each options entry
    foreach ($gormFields as $keyForm => $valueForm) {
      //Check if the titles match and if the field has a value defined (this can be anything set in the gravity form)
      if ($valueForm['label'] == $checkboxField['title'] && $entry[$valueForm['id']] != '') {
        //If both criteria is matched, create row in $options array and defined as 'set_value' from wpcf data
        $options[$key] = array($checkboxField['set_value']);
      }
    }
  }

  //update meta field
  update_post_meta($post_id, 'wpcf-'.$wpcf_field, $options);

}