PO Validator B2B

Develop by byKlemm

$4.99-$9.99

/ Month

Free plan available

Ensure valid Purchase Orders with Shopify checkout validation and customizable rules.

About PO Validator B2B

Launched Jun 07, 2026

Built by byKlemm

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Description

Blocks checkout without a valid PO number. Prevent invalid B2B orders before they reach your team.

B2B merchants must attach a Purchase Order number to every order, but Shopify provides no native way to enforce this. Buyers skip the PO field or enter invalid data, causing fulfillment delays and ERP mismatches. PO Validator solves this with server-side validation via Shopify Functions. Buyers cannot complete checkout without a valid PO number. Configure rules: required field, min/max length, mandatory prefix, regex patterns, allowed characters, and multilingual error messages.

Server-side checkout validation that buyers cannot skip or bypass
Flexible rules: length limits, required prefix, and regex for ERP formats
Character rules: whitelist allowed characters and block unwanted spaces
Regex rules: validate PO formats against ERP and SAP number patterns
Supports EN, DE, FR, and ES error messages out of the box