custom challenges - most credits dished out -

Hi, I wan’t to know what’s the easiest custom challenge, that dishes out the most credits?
So, far MM medals custom challenges have been giving me the most, but it takes a lot of time to do it. Need a no time killer challenge that can serve a lot of credits.
ty,
x x x SICK X X

The quickest and easiest challenge - with the biggest payout - for me has been this:

MEDALS
– Campaign on Legendary w/ All Skulls On except IRON and BLIND
– ONI Sword Base
– 400 Medals

Payout = 5000 cR

Combine this by adding this challenge:

KILLS
– Campaign on Legendary w/ All Skulls On except IRON and BLIND
– ONI Sword Base
– 400 Kills

Payout = 5000 cR

Doing both of these and “farming” the Target Locator nets me 10,000 cR in less than 10 minutes. 10-minutes of solid killing w/ TL and doing the Revert To Last Checkpoint as soon as you see the medal count stop and the TL begins to reset gets me nearly 600 kills and about 550 in medals - more than enough to complete the challenge. 9-minutes gets me roughly 500 kills and 450 medals.

You can then Save and Quit, go back to Waypoint, turn-in both challenges, make 2 new ones identical to the previous, and return to your save point and in 10-minutes or less get another 10,000 cR.

5,000 cR is the max you can earn on Campaign challenges it seems so this seems to work the quickest and nets me the most cR quickly.