How To Get Memorial Coins in LifeAfterThese are Invasion Event-related currency. There are several ways to obtain the Memorial Coins in LifeAfter.
Donate suppliesThis is done in your camp. Depending on the state of the invasion, you'll find several NPCs in your town's plaza. Give them the supplies they need and you'll get a considerable amount of coins in return. However, the number of coins you'll get from them is limited per day.
Kill Imperial SoldiersIn the Fall Forest, Sand Castle, and Snow Highlands maps, you will see many imperial soldiers group. Kill the soldiers. After killing a few imperial sergeants, you will get a reward of a few Memorial coins.
Rescue HostagesAt the same imperial camps, you will find people in need of rescue. interact with them and help them to leave for rewards to get 1 Memorial Coin each.
Resistance Operation EventYou can also earn these memorial coins from the resistance operation event. To take part in the event the event keep an eye on your mini map for some red circles / radars / route signs. Try to inflict as much damage as you can. You will get the memorial coins after the event ends.
In addition to these there are some NPCs who can give you memorial coins. Iguana at Fall Forest and Apophis in Snow Highlands. You will find them near the defense camp (shield icon on the mini-map).