There's nothing stopping you from converting the BTC to fiat the moment you get paid, or for a service to automatically do this like BTC merchant services (no idea if this service does it).
For merchants Bitpay guarantees that you'll get the exact fiat value transferred to your bank account that the item was originally priced at.
For merchants Bitpay guarantees that you'll get the exact fiat value transferred to your bank account that the item was originally priced at.