As you are considered independent suppliers of our platform, you need to have been registered either as a business, self-employed individual or a freelancer. In any case this registration will give you a Serial number given by your local tax authorities, which we kindly ask that you upload the information via the "Invoice Data" section of your Extranet.
https://www.xmodels.com/en/secured/extranet/stats/invoice_data
If you are a resident of an EU country, you will also be given a VAT number for services rendered between other EU countries. You will also need to upload this VAT number in the above mentioned page, unless you are a resident of Luxembourg.
Should there be any question about your local country's situation, we invite you to consult this page for the available accepted business registration types: https://www.ecb.europa.eu/stats/money/aggregates/anacredit/shared/pdf/List_of_national_identifiers.xlsm