Using the barcode field formatter

Out-of-the-box, the Barcodes module supports all of the standard string and numeric fields that come bundled in Drupal core. These are:

• email
• integer
• link
• string
• telephone
• text
• text_long
• text_with_summary
• bigint
• uuid

But Barcodes can be extended to apply to any field that holds data that can be encoded into a barcode of the type you choose.

The standard way to customize Drupal for your site is to implement a hook. If you wanted to add support for the "serial" field type, for example, you could implement a hook like this:

/**
 * Implements hook_field_formatter_info_alter().
 */
function yourmodule_field_formatter_info_alter(array &$info) {
    // Allow the barcode field formatter to be used on a new field type.
    $info['barcode']['field_types'][] = 'serial';
    // You may add additional lines for each field type you want to support.
    $info['barcode']['field_types'][] = 'temperature';
}

Details of how to implement a hook for your site is out-of-scope of this documentation guide, but you can read the official Drupal documentation on how to implement a hook for details. (need link here)