The coin can be collected by simply walking through it after which it will float and fade away and be added to the count.
It is exclusive to Co-op Strike missions. Every mission features three coins scattered and hidden in the premises. Once all three coins are collected, an additional 5,000 points is added to the players' Final Team Score.
|Phoenix Compound||The Extraction||Garage|
|Phoenix Compound||Once More Into The Breach||Ladder|
|Phoenix Compound||The Enemy Of My Enemy...||Garage|
Bugs & Exploits
Although more than three coins can be placed in custom Co-op Strike maps, if more than three are picked up, the counter will continue to register coins over the three required, causing the 5,000 points bonus to be unobtainable. 
- Tested on custom created map