This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
regionCode read-only attribute of the
PaymentAddress interface returns a one-, two-, or three-alphanumeric code
DOMString) representing the region of the address (e.g., "CA" for
California, or "11" for Lisbon, Portugal).
The code is derived from the ISO 3166-2 standard, which defines codes for identifying the subdivisions (e.g., states, provinces, autonomous regions, etc.) of all countries in the world.
If the browser can't determine the region code, or the country doesn't use regions for postal addresses, it returns an empty string.
var regionCode = paymentAddress.regionCode;
DOMString indicating the one to three character alphanumeric code
representing the region portion of the address. This should correspond to
region, but should be the ISO 3166--2 standard's region code. The string is
empty if the region code couldn't be determined, isn't needed for the address's
country, or was not provided.
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