Where can I find the shared secret for my mail subscription service?

[DarkKnight]

Hi I am trying to setup my store to use a mail subscription service. They are requesting the following:

• Api Key (I have)
• Api Secret (I have)
• shared secret (I don't have)

Where do I find the shared secret?

I went to the Apps -> Develop Apps for your store -> Added an APP and installed it

However through this, I can't find a way to get the shared secret. 

What does it come from? Can someone please help me.

Thank you

[DarkKnight]

I don't fully understand. What is this code and it is not mentioned anywhere and I am not given that option as well. 

[DarkKnight]

Can Someone please help me with this. How do I get the shared secret key that my service provider is looking for?

Am I going about this the wrong way? 

[binneywood]

Hi did you find the shared secret key ? I'm looking too