adding an extra line to a credit card bill

[Bushmaster]

You know, like for a tip or something.

Anyone know how easy (or not) it is for a retailer to add an extra line and whether this item can have a form of words to describe it i.e. 'tip' or 'additional contribution towards owners yacht' or somesuch?

Ta.

[mk1fan]

The credit card processing service provider would supply the required software to have this function . Really easy to use now with chip and pin.