It would seem to me tips given on a credit card bill could be treated as a "service charge" & below is a description from ROB of how the "service charge" is handled here....

"If your bill has a "service charge" then this is a shared tip for all the hourly employees, not a direct tip to your bartender or server. The Jamaican government enacted the service charge in the tourism industry so that more Jamaicans benefit when people visit Jamaica.

A service charge of 10% is added to the bill, then it is totaled from all receipts during that pay period, and then split between all hourly employees equally, from the bartender to the gardener to the housekeepers. That way, when a guest purchases something, more than just the server makes a bit of money.

For a simple example, lets say a server hands you a bill for us$100, with a $10 service charge added. The server will not get that $10 service charge directly. Lets suppose there are 10 employees total at the property. At the end of the pay period, that $10 charge will be split between all 10 employees equally. So while the server did not get the entire $10, they did receive $1 from it as did all the other employees.

The service charge is set at 10% so that it leaves room open for you to tip the server directly in cash - and that tip is up to your discretion. You can leave an additional 5% that they will keep for themselves, or any additional amount that you choose.

It is often speculated that the employees never see the service charge. You may even hear that from the employees themselves. But this is simply not true. If a business has a service charge, then the business can be fined and even closed should they do not share this with all their hourly employees. A server may say they never see the money, but they do see their percentage of that charge which is of course much smaller depending on the number of employees. For the example above, the server may feel they didnt get anything from it, because they never saw 90% of the charge. But they did receive their percentage on their paycheck.

I hope this clears up the issue a bit."