Making Tax Digital (MTD)

Hi,

I am thinking to make a Making Tax Digital (MTD) solution on NAV 2009 classic as well as in excel and may be an app to submit vat returns via phone

some work is already done like calling hello world.
Do I need client id and token, I put my client id and token on NAV 2017, it does not work, I believe it is Microsoft specific
then if I write my own on classic nav or excel vba, how is it going to work

is anyone able to help or share VBA code?


Thanks