There may come a time where you need to ensure that the postal codes entered in by your UK customers are valid. The code recipe below uses the free third-party API to validate the postal code upon checkout. This code recipe could be adapted to validate for other regions.

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The Code Recipe

Adding the Recipe to Your Website

You can add this recipe to your site by creating a custom plugin or using the Code Snippets plugin available for free in the WordPress repository. Read this companion article for step-by-step directions on either method.

The validation will only run if the “Billing County” on the Membership Checkout form is set to the UK.

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