can heat radiate from a cold to hot body? if you have 2 bodies (A,B), with Temperature of B>A, can you have heat transfer from A to B through radiation? 
In particular if A reflects the wavelengths that B is emitting the radiation at would this be possible? 
And if so is this process independent of the temperature of B (since A is reflective) or does A radiate as a function of the temperature difference  with its surroundings (in this case B).
I was thinking of how this applies to radiative sky cooling: the process by which you use the radiation of object A to disperse heat, and create A reflective of the Sun's radiation to not heat up from that. 
The universe is about 3K, if it was 200K, would this process differ? 
 A: Yes, some times it is possible
This is happening in refrigerator.
In this case some energy must be supplied to complete this transaction
A: 
if you have 2 bodies (A,B), with Temperature of B>A, can you have heat
  transfer from A to B through radiation?

Yes, for instance, if radiation from A is focused on B, while radiation from B is directed elsewhere. The relevant statement of the second law of thermodynamics says:
Heat can never pass from a colder to a warmer body without some other
change, connected therewith, occurring at the same time.
While heat is transferred from A to B, B is radiating into universe, which should cause "other changes". So, there is no violation of the second law of thermodynamics.

In particular if A reflects the wavelengths that B is emitting the
  radiation at would this be possible?

Yes, it is possible. It could be viewed as a variation of the first scenario. 

And if so is this process independent of the temperature of B (since A
  is reflective) or does A radiate as a function of the temperature
  difference with its surroundings (in this case B).

Yes, it should be independent of the temperature of B. It could be affected by the temperature of B indirectly though, for instance, if B heats A to the extent that the radiating efficiency of A decreases, but that is unlikely considering that A reflects most of the radiating energy.

The universe is about 3K, if it was 200K, would this process differ?

No, for the same reason, i.e., as long as the radiating efficiency of A is not affected by it being heated too much by the universe, which should not be the case with the universe at 200K.
