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I am not sure if there is a Customs desk near check in, however the gate to go down to Security, Immigration and TRS is not opened until 05.00
The TRS desk just to the right of Immigration was not manned when I went passed at about 05.15 but there were 2 guys there when I went back just before 06.00. I used the online form which sent a barcode to my phone app. The guy scanned my barcode, looked at the item for 1 second and processed the refund to my CC. The whole process took about a minute.