What are the rewards for rescuing a hostage / courier?

I came across a courier in a mission who was all tied up, as seen here:

I looked forward to getting some reward at the end of the mission, but unfortunately I failed the mission due to interference by @TimStone, so now I'm left wondering exactly what the reward would have been if I had manage to both finish the mission and rescue the hostage. Given the risk/reward nature of the game understanding what the reward would have been goes a long way to deciding how much trouble I should go through to rescue these hostages when I come across them.

Some internet digging reveals that another name for a courier is a hostage, but I can't find any information on what the reward is for successfully saving a hostage.

What are the rewards for rescuing a hostage or courier?