If you represent an institution, you will be able to pay through your treasury, on presentation of the pro-forma invoice which will appear on the screen at the end of your order. All the information you need to send the payment will be given to you at the end of your order.
Payment by Western Union is possible for new orders of more than 50 euros. If your order meets these conditions, edit your quotation on the sales site and then contact us to receive the form and the necessary instructions.
As administrator of your server, only you can ask lists to deblacklist you.
If a list asks you to pay to be unblacklisted, do not pay as this is abusive and generally this type of list is very rarely used, so it is of little penalty to your business.