tracking non consumable items, best practice

hi
Séance google dose not track consumable items , if for some reason the game crashes after the purch is done but before the game could register the purches ,

what is the beast way to handle these situations ? can we verify a purchase operation manually from google ?
cause the gamers will send us an image of his account balance ,verifying the purchase , how can I verify that what he says is true ?

regards