Inserting Meta tag


I’ve created an app that I am planning to use for affiliate marketing. For many affiliation platforms, I need to insert a meta tag to the homepage.

Is there anyway i can do that ?

Could you expand your scenario a bit?

In order to confirm the ownership of the App, i need to insert a meta tag that they provide in the header of my homepage.

So you want to insert an organization specific value in header of your App homepage?
Can you do that after user logs in? Store their association in user profile? Then use that for your purpose?