Some notes on using Trydent from across the pond. VAT - The US does not have VAT numbers for tax purposes - they are specified as SSN (sole-proprietorship) or EIN/TIN (tax identifier numbers). EIN/TIN numbers are typically used for parties (customers) that are tax-exempt so do not get charged sales tax when a sale is closed.
Barcodes - The US still uses UPC-A/E codes for barcodes. The simple fix is a UPC-A can be verified using EAN checksum by prepending '0' to the number: i.e., a barcode of 725310130697 (12 digits) by using EAN validation with '0'+'725310130697'. Label of the barcode field as EAN only might be confusing to some users in the U.S. Non-profit entities - For non-profit companies, a valid IRS 501(c)3 letter must be accompanied. Not normally an issue since a company selling goods/services will still charge sales tax; however, some companies (i.e., a webhosting company) may provide services for free with a valid 501(c)3 letter from the IRS. This is based on what I've been learning with 3.0, so may not apply with v3.2. Still learning Tryton, so may add some more changes in the future.
