PO Validator B2B

PO Validator B2B

Pricing
Free plan available. Free trial available.
Rating
0.0 (0 Reviews)
Developer
byKlemm

Featured images gallery

PO Validator: valid PO numbers required at B2B checkout
  • PO Validator admin: set required field, length & prefix
  • PO Validator admin: regex, character & error message rules
  • PO Validator checkout error for invalid PO number format
  • PO Validator: valid PO numbers required at B2B checkout
  • PO Validator admin: set required field, length & prefix
  • PO Validator admin: regex, character & error message rules
  • PO Validator checkout error for invalid PO number format

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.

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. more
  • 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

Languages

English, German, French, and Spanish

Works with

Categories

Pricing

Free

Free

Features

  • Required PO field enforced at checkout
  • Built-in errors in EN, DE, FR, and ES

Starter

$4.99 / month

Features

  • Everything in Free
  • Minimum and maximum length validation
  • Required prefix rule (e.g. "PO-")
  • Regex patterns for ERP and SAP formats

7-day free trial

Pro

$9.99 / month

Features

  • Everything in Starter
  • Character rules: whitelist, no spaces
  • Custom error messages per language
  • 24/7 email support
  • Personal onboarding session
  • Custom feature requests welcome

7-day free trial

All charges are billed in USD. Recurring and usage-based charges are billed every 30 days.

Reviews

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Support

App support provided by byKlemm.

Resources

Developer

byKlemm

Lindenschulstraße 25, Stuttgart, 70327, DE

Launched

June 8, 2026

Data access

This app needs access to the following data to work on your store. Learn why in the developer's privacy policy .

View staff and contributor data:

Store owner

  • Store owner

    Name, email address, phone number, physical address

View and edit store data:

Shopify Functions

  • Edit Shopify Functions

    Cart and checkout validations

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