Cannot buy online cubase

I ve tried for all two days for buy online cubase10.5 but not success it shows as attact file I email and ask around but no answer please help. I ve checked from my bank many times officcer told me everything OK

I don’t think Steinberg can fix this for you. But I did notice, in your picture, where you scribbled out the numbers, that there is nothing in the “security code” box. Did you not fill that in? I believe it would be required or the card may fail to be authorized.
If that is not it then it is likely something in the Visa/MasterCard system that is declining the purchase. Best to try a different card.

Try Paypal maybe? I would also remove your name/address from the screenshot else you may get lots of fan mail ;p

Yes it allows only paypal.