ive continuously tried to purchase traktor pro 4 and it will not authenticate my payment method, please somone help
Only Customer Care or Support can help you with that.
Try contacting N.I. Purchase Support they have chat support once you get past the bot , at least they do so on normal work days in daytime but I don't know about weekends.
(You need to use a browser with Cookie , Security and Extensions settings that will allow for log-in on the page for the page to work)