> customer sends mint to seller
> seller checks if it's there: yes
> seller checks if it can be sent to any of the Lightning nodes he likes: yes
> seller checks if he can send double or tripple that amount there: yes
> "Payment received and economic validation verified. Thank you for your purchase".
If any of these is a no:
> "We cannot accept the eCash from MintName because ReasonHere:CheckFailure. Use a different mint."
This example can be applied for user to user, but manually "ur mint is shit, use a different one."