Zelle. It is a free, fast, safe, and easy way to send money in minutes from one account to another. Every major bank offers this service under your online account. You will just need to send your money:
In memo, you can write the purpose of your donation: Masjid Operation, Sadaqah, Zakah, Fitrah, Fidyah, etc. You can send money as low as $1 to as much as you want with no fee and hassle.