> For the complete documentation index, see [llms.txt](https://galmis.gitbook.io/barcodify-customer-selector/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://galmis.gitbook.io/barcodify-customer-selector/getting-started/synchronise-merchant-issued-custom-barcodes-with-the-app.md).

# 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)


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