Does your link look like this? bitcoin:?r=https://bitpay.com/i/Pg6Kwq...Edit: Image wasn't showing...
Looks like this is part of a new Bitpay update that uses Payment Protocol URL instead of a simple Bitcoin payment address. Which is IMO something pretty dumb.
I'm not sure if there is any way to get the address directly. But that's what Bitpay has to say:
If you are using a non-Payment Protocol wallet or service to pay BitPay invoices, you will need to move your spending bitcoin to a wallet or service which can support Payment Protocol. We strongly recommend that you use a true bitcoin wallet for spending to avoid delayed transactions, but you will be able to use any service compatible with Payment Protocol.
Source:
https://blog.bitpay.com/payment-protocol/I know mate. In their list of payment protocol wallets bitcoin core is listed.
But it doesn't work. This is really a weird decision by Bitpay.
Edit: CORRECTIONS
12/15/17: A previous version of this post did not include the Bitcoin Core wallet as a compatible wallet. We have updated the post. Hmm.