# Synchronise "merchant-issued" custom barcodes with the app

"Barcodify - Customer Selector" can [automatically create customer barcodes](/barcodify-customer-selector/getting-started/share-app-generated-barcodes-with-customers.md) with Shopify customer IDs encoded for you. However, if your customers use barcodes of a different format, you'd need to pair them with the app.

{% hint style="info" %}
Follow the subpages of this guide if your customers own physical cards (or other objects) with unique barcodes and the encoded values are not recognisable by Shopify's customer search. I recommend using [app-generated barcodes](/barcodify-customer-selector/getting-started/share-app-generated-barcodes-with-customers.md) if your customers don't own any objects with unique barcodes.

Synchronising such values with the app would only make them recognisable by the app and not the rest of Shopify.

If you prefer more barcode customisability that the app doesn't provide (e.g. different styling), you could still do so, but I'd recommend encoding Shopify customer IDs as you wouldn't need to sync such barcodes with the app. Searching customers by Shopify customer ID is also the fastest method.
{% endhint %}

There are four methods to synchronise custom barcodes with the app:

1. [Enter barcodes in the admin version of the app](/barcodify-customer-selector/getting-started/synchronise-merchant-issued-custom-barcodes-with-the-app/enter-barcodes-in-admin.md)
2. [Enter barcodes in the POS customer profile](/barcodify-customer-selector/getting-started/synchronise-merchant-issued-custom-barcodes-with-the-app/enter-barcodes-in-pos.md)
3. [Import barcodes](/barcodify-customer-selector/getting-started/synchronise-merchant-issued-custom-barcodes-with-the-app/import-barcodes.md)
4. [Populate barcodes from customer metafield](/barcodify-customer-selector/getting-started/synchronise-merchant-issued-custom-barcodes-with-the-app/populate-barcodes-from-customer-metafield.md)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://galmis.gitbook.io/barcodify-customer-selector/getting-started/synchronise-merchant-issued-custom-barcodes-with-the-app.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.