DJI Care Refresh is only available for authentic (non-counterfeit) DJI drones meaning the serial number is valid with DJI. If your drone qualifies, you can only purchase DJI Care Refresh in the region where the drone was purchased.
I don't have a part 107 so feel free to completely ignore my comment which follows:
It's not necessarily a no fly zone if it not in the red zone. Washington DC is a no fly zone. It's restricted or controlled airspace and it's a 0 grid and...