NZPost

This is a passthrough proxy to the datapower to allow WNZL Cloud systems to
make a call to nzpost api via our network. The datapower service is also a
proxy but handles the oauth to the nzpost api.
https://confluence.westpac.co.nz/display/ITINTEGRATE/NZPostProxy - MPGW [1]

[1] https://confluence.westpac.co.nz/display/ITINTEGRATE/NZPostProxy+-+MPGW