There are different views regarding payment of zakat fitrah and zakat on wealth.
For zakat fitrah, you are required to pay it in the country where you will be spending the night of Hari Raya Aidilfitri.
For zakat on wealth, you are required to pay it in the country where your wealth has increased.
Even so, this is just a general guidance. If there are complications in fulfilling the payment of zakat in this particular way, it is permitted to pay wherever that is suitable.