Validate Shipping Address

Use checkout validation rules to block orders with invalid or unsupported shipping addresses — such as PO Boxes, specific zip codes, or missing address fields.

Block PO Box Addresses

  1. Click Create rule → Checkout validation.
  2. Set up the rule:
    • Error message: “We cannot ship to PO Box addresses. Please enter a street address.”
    • Error position: Address (line 1)
    • Validation trigger: On condition
  3. Add condition: P.O. box address (boolean — no value needed).
  4. Click Save.

This blocks checkout whenever the shipping address is detected as a PO Box.

Block Specific Zip / Postal Codes

To prevent orders from specific postal codes:

  • Condition: Zip / Postal code → Equals to → “90210”
  • Error message: “We do not deliver to this postal code.”
  • Error position: Zip / Postal code

To block a range, use multiple conditions in separate OR groups:

  • Group 1: Zip / Postal code → Starts with → “90”
  • Group 2: Zip / Postal code → Starts with → “91”

Require Specific Address Fields

Block orders with missing apartment/suite:

  • Condition: Address line 2 → Is empty
  • Error message: “Please enter your apartment or suite number.”
  • Error position: Address (apartment, suite, etc)

Block orders with missing company name (B2B):

  • Condition: Company → Is empty
  • Error message: “A company name is required for business orders.”
  • Error position: Company

Restrict to Specific Countries

  • Condition: Country → Not equals to → your supported country
  • Error message: “We currently only ship to the United States.”
  • Error position: Country Code

To allow multiple countries, use separate OR groups — one per excluded country — or use Equals to with your supported country.

Validate Address Length

To catch addresses that are too short to be real:

  • Condition: Address line 1 → Characters length less than → 5
  • Error message: “Please enter a complete street address.”
  • Error position: Address (line 1)

Detect Missing House Numbers

The app has a built-in condition for this:

  • Condition: Missing house number (boolean — no value needed)
  • Error message: “Please include your house or building number in the address.”
  • Error position: Address (line 1)

Good to Know

  • Match error position to the field. If you’re validating the zip code, place the error under “Zip / Postal code” for the best customer experience.
  • PO Box detection checks address fields for common PO Box patterns (PO Box, P.O. Box, Post Office Box, etc.).
  • Test with real addresses. Use Test mode to verify your validation catches the addresses you want to block without blocking valid ones.