Mechanic for secret actions in a card game
I'll illustrate with a five-player example.  It is player A's turn.  Based on my reading, I am assuming the following things.  Are these assumptions correct?


Players B, C, D and E each play a card face down and give it to player A.
All cards are played simultaneously.
Player A does not know which player played which card.
Some cards may cause player A to lose resources to another player.


If the above are true, use the following arrangement and turn workflow.

Setup / components


Each player has a screen behind which they can keep their resources available for easy access, but hidden from others.
The game board will contain a number of spaces for playing cards face down. These places will be labeled with numbers.
Resources are the same size and shape, even for different denominations. 
A number of opaque bags (with drawstrings for easy and quiet opening and closing) are available


Turn flow


Player A looks away from the board.
Players B, C, D, and E, each plays a card on one of the available spots on the board.
Once all cards are played, the player to A's left tells A that they have finished.
A looks back at the board.  A takes 1 card, reads it, and fills a bag with the required resources from behind his screen.  If the card does not cause a resource transfer, player A places a 0-resource token in the bag.  A replaces the bag where the card was.
A repeats the above step for each card.
A looks away from the board.
Each player takes the bag from the spot where they placed their card, and claims the resources from it.
Once all cards are played, the player to A's left tells A that they have finished.