Bar bill
A bar bill or bar tab was an account of debt owed to a bar by a patron for goods and services. 

While playing Dixon Hill on the holodeck, Jean-Luc Picard once forgot to bring money with him to pay his character's bar bill. The bartender Rex gave him another drink nevertheless. ()

While under the impression that Julian Bashir and Miles O'Brien were dead, Quark gave a toast in their honor, "They were good customers. They always paid their bar bills on time." Quark could think of no greater tribute. ()

In 2371, Tom Paris told Captain Kathryn Janeway that Chakotay considered him a mercenary, willing to fight for anyone who paid his bar bills. ()

Also that same year Quark had to deal with a drunken Klingon named Kozak who would not pay his bill and was ordering bloodwine without paying. Kozak tried to stab Quark while Quark tried to disarm him. Kozak leaned over and accidentally stabbed himself with his own knife and fell dead on the bar stool. ()     

While under the influence of the Bajoran Prophets in 2371, Grand Nagus Zek bought everyone present in Quark's a drink and asked Quark to put it on his tab. ()

After being informed of Morn's apparent destitution at the time of his death, Quark commented that Morn had always paid his bar bills on time and that money had to have come from somewhere. ()

Benjamin Sisko, after playing a baseball game against a team of Vulcans led by , bought everyone present in Quark's a drink and asked Quark to put the cost on his tab. ()

In 2375, Worf disputed responsibility for a bar bill with Quark, but eventually paid it after Quark mentioned that it would not be good if word got out that he was refusing to honor the debts incurred by his own House. ()

Later that year Worf bought the crew of the  three barrels of bloodwine from Quark and put it on his tab. After Worf was missing following the destruction of the ship, Quark told Ezri Dax that Worf would return, as he would not want to go to Sto-vo-kor indebted to Quark. ()
Fees and payments
The Dixon Hill Series