> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pillsoftware.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Packing stations / PO boxes

> Detect and block PO boxes and packstations in checkout and post-checkout using custom keywords and field scanning.

## Packing stations / PO boxes

### What this does

AddressPill detects packing station and PO box patterns from your keyword list.

### Why this matters

Many merchants cannot ship to these destinations for certain carriers or workflows.

### What you can control

* Enable packing station detection
* Block in **in-checkout validation**
* Block in **post-checkout validation**
* Choose checkout action: warning or block
* Add custom keywords
* Choose extra fields to scan (Address line 2, Company)

### Where to configure

Open [Packing station settings](/settings/packing-stations-po-boxes).

## FAQ

### Can AddressPill block PO boxes in Shopify checkout?

Yes, you can block or warn in in-checkout validation and also enforce rules in post-checkout validation.

### How does packstation detection work?

AddressPill scans address text against your keyword list and selected fields.

### Which extra fields can be scanned?

Address line 2 and Company, in addition to address line 1 and city.