Is it legal for a bar to charge your credit card if you forget to close out your tab?

Question Details:

I left my tab open at a bar, only made 2 drink purchases for $12, and $15, and forgot to close out my tab at the end of the night. I am friendly with the manager so I called him right after I left to tell him I forgot my credit card. He said he would lock it up in the office. I checked my credit card statement days later and there was a charge for $79. I do not know if this was a mistake or if somebody deliberately charged my credit card because I forgot to close out my tab and I want to know if it is legal for them to do that?

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