Validate a postal code

https://postal.openverbs.com/v1/countries

List every ISO 3166-1 alpha-2 country code for which a postal-code pattern is available.

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https://postal.openverbs.com/v1/format

Normalise a postal code's casing and whitespace (uppercase, collapse runs of spaces) and report whether the normalised form is valid for the country.

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https://postal.openverbs.com/v1/spec

Return the validation regular expression (source and flags) used for a country's postal codes.

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https://postal.openverbs.com/v1/validate

Check whether a postal / ZIP code is well-formed for a country (ISO 3166-1 alpha-2). A malformed code is a successful result with `valid:false`, not an error — only an unsupported country or empty code is a 400.

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