<prompt> Human: I ask here because I know this group watches their credit card expenses like a hawk. I have noticed that when eating out, often times the tip amount does not show up on the credit card statement. For instance, we ate at a restaurant on 716. The total was 56.72 for the food and drinks. This was drive up take out so I tipped an even 10.00 not a full 20 I checked my CC today and the total was 56.72... not 66.72. I have noticed this before. Any idea whats is going on?  <response>: Im not totally clear on the specifics, but my understanding is that the 56.72 is a pre-authorized charge that gets updated to the post-tip value soon afterwards.As an anecdote, I use Mint, which for instance shows the pre-authorized amount as a pending charge. 