In manual raw tx creation, how do you specify the amount of the bitcoin to be sent?
99900000 in hex is 5F45A60. Padded out to be a 64-bit integer makes it 0000000005F45A60. But Bitcoin uses little endian for most things, so this will need to be converted to little endian by byteswapping. So the final value put into a transaction is 605AF40500000000.