Create GET_KEY_MAPPING

You are doing it wrong. No matter the name of the function.

You need use this: FiveM Hash Generator
eco_fishing_ngs = ~INPUT_AD4D66C2~
fishing_gs = ~INPUT_19077CB2~

And this text you subtract ~INPUT_ and ~.

Then adds 0x at the beginning. (This is to be interpreted as a hexadecimal number)
The final result:
eco_fishing_ngs key = GetControlInstructionalButton(0, 0xAD4D66C2, 1)

Also say that if you change the name of the function (eco_fishing_ngs, RegisterKeyMapping is clear for this function, for all players. Because AD4D66C2 = eco_fishing_ngs)

If you like more information go to my post for this