It's no problem to change. Even if you choose Western Union, you can still pay via Paypal.

You can send money directly to our Paypal account

Please let us know your order number in the comments(when you pay via Paypal you can add comments).

You can also contact our online salesman,They will help to send you an money request to your Paypal account.Then what  you  need to do is just accept  it. 

As soon as we confirm that payment has been received,we will start to process your order.

Small tip:We offer 5% discount for Western Union payment, so you will can not enjoy this discount if pay via Paypal.For handling your order smoothly,please make sure the amount of your order before payment