GTIN Validation

This function checks the validity of GTIN-8, GTIN-12, GTIN-13, and GTIN-14 using the check digit.

A number of classes/functions have been written in different languages, such as Java, PHP, Ruby, TSQL, Javascript, Swift 5, and VBA/VB6 - the supported list :-

Languages Supported

Java, PHP, Ruby, TSQL, Javascript, Swift 5, and VBA/VB6.

Partial Implementation

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