I am also facing the same issue, I added my Visa debit card to be able to buy connects but the purchase was not successful.
Also, I tried to add my PayPal account in the billing method, never gets completed because at the later part of the process it is asking for a card number, but a PayPal account only has an Email address, no card at all. Can somebody please help me so I can buy additional connects.
For the issues you are having with your debit card, you need to check with your bank for more information on why the specific charge was declined.
In order to use Paypal as a billing method on Upwork, your Paypal account must have a linked credit or debit card for recurring payments (for example, for membership fees). For cases like this, a funding source is required to add Paypal as a billing method.
Additionally, please note that your profile must represent you as an individual and that all the information in your profile including your profile photo needs to be accurate, truthful, and verifiable. Please check this help article for more information on how to update your profile photo.
As Aleksandar mentioned earlier, you may need to check with your bank for more information on why the specific charge was declined. If you've done this and they confirm everything is ok on their end, please feel free to reach us out again so we can assist you further.