Q. Shalom Aleichem Harav
When doing kaporos with money, can one use a credit card instead of cash and have in mind to donate a specific amount of money to tzedaka?
Bevirkas kesiva vachasima tova

A. A Poskim disagree whether one can use a cheque for kaporos. Horav Chaim Kanievski’s Shlit’a opinion was to shun using them, (Macheves Am p. 487). Moadei Hagrach maintains that it depends on the different views of Poskim in regards to the monetary value of a cheque in Halacha. Some see it only as a document instructing the bank to pay without any intrinsic monetary value. (Chut Hashoni p. 247, Ateres Shlomo C.M. 25), Others disagree and maintain that it is actual money. (Lehoros Nosan 8: 103, Devar Yehoshua C. M. 3: 7, See also Mincha Yitzchok 5: 120).
Horav Shlomo Miller’s Shlit’a opinion is that a credit card is not considered currency, and should not be used by those who usually do kaporos with money.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a