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If gateway is made by coinpayments you should ask coinoayments I guess.
Changelly or Shapeshift also should have one.
Soeey if I didn’t understand your question correctly.
here are some dev tools, maybe this will help.
https://docs.nem.io/en/dev-tools
I am really not sure what you are trying to achieve though.
Thanks for the answer
Now the market is very much stolen and we do not want that they would hit us.
That’s how best to connect that would not take stolen.