Bernhard-Krop

@casperbakker Yes, it was kind of confusing at first. The problem is not, that the codes are too intertwined. UPC-A, UPC-E, EAN-8 and EAN-13 are created the same way, just...

@casperbakker I've provided a [pull request](https://github.com/picqer/php-barcode-generator/pull/165) to fix the above problems. I have to admit, that the issue with uppercase letters does not exist. This was a misunderstanding of mine....

I figured out that the implemented UPC-E barcode is only working with UPC-A codes as input (properly converting them into UPC-E), but not with proper UPC-E codes as input. I...

@casperbakker , @samymassoud , @oitowl7 I've provided a [pull request](https://github.com/picqer/php-barcode-generator/pull/163) for this issue. Once merged into the main branch, it should fix all your problems. Please, let me know if...