I have opened an Facebook ADS account on old account.
I wanted to add Paypal as payment method, but
while adding logging in the Paypal thoutgh popup window, i've got this error:
"We are unable to complete your request at this time. Please try again later. We apologize for the inconvenience."
This was newly created PayPal account. Created on mobile ISP IP.
I did some buying for domain and ebay before adding it to the FB. Those purchases went through normally but were small.. each below 1€
Paypal answer:
"First of all, I apologise for any inconvenience and appreciate the efforts that you have made to resolve your issue.
In regards to your request I carefully reviewed your account and I can see that when you tried to proceed with your payment of $25.00 USD, our internal security system has stopped it.
To provide one of the safest online payment methods PayPal reviews every payment before it's approved. When a payment is blocked, this is not a reflection of you or your account activities. Our internal security system is an automated system which reviews all of the details of every payment that is made through PayPal. This is similar to the way your bank or credit card issuer approves transactions.
We are committed to your satisfaction. So, in order to resolve this issue, as we will need to make some updates on your account and you should be aware of the time when we initiate them, we would kindly ask you to call us by phone.
Our customer support telephone line (00353 1 436 9111) is open from 8.00am to 4.30pm GMT/BST Monday to Friday. You can use Skype or similar VoIP service with call out credit to save on call charges."
As I want to have multiple such accounts.. calling is a bit out of the way to approve them.
Can anyone help or direct me, what I am doing wrong?
Paypal is as solid as it can get. Just work with their customer support to fix the issue.
These are farmed accounts.. a lot of them, so I search for a better solution than calling them each time 
Unfortunately, in the case you described consider the account flagged from paypal and even support would not be able to help you here. They will probably be willing to, but as soon as their algorithm detects a throwaway-paypal-for-facebook-ads-account, you'll almost always be unable to recover from. I believe going around those new paypal restrictions has recently even gotten harder than creating a new fb ads account altogether.
You need a new VPS with preferrably the same OS and Geo. Browser would be Chrome anyways so you can use PEditor. Relogin on your fbook account and play around for a few days. Create this new ppal account and let it MATURE for a week or two. Still make your purchases like you did before.
@Mihalis
Thx for advice.
For clarification... paypal accounts were only 1-2 days old.