Three numbers get confused with each other. What you invoiced, what you collected and what has reached your bank are not the same. The gaps between them are normal.
Invoiced
What you have billed. It includes anything unpaid, so it is the most optimistic of the three.
Collected
What customers have actually paid. This is your real revenue for the period.
In your bank
What has been paid out to you. Card payments settle on a delay, so the money arrives after the customer paid it. That gap is normal and is not money going missing.
Fees
Card processing takes a percentage. What is paid out is what the customer paid less fees, which is why a payout rarely matches a day's takings exactly.
Gift cards are not revenue yet
Money taken for a gift card is a liability until the work is done. Counting it as income is how businesses end up busy in February with nothing coming in.
Common questions
Why is my payout smaller than my takings?
Processing fees and the timing of when payments settled. Open the payout to see what it covers.
When does the money arrive?
Payouts run on a schedule with a delay after the payment. See payouts and getting your money.
Which number do I give my accountant?
They will want the detail rather than a headline. Export the underlying data.