How do they generate ecode for Apple Music and Apple TV subscription

When I did a Google search for "eCode Apple Music", this is one of the links that came up. If you follow it in Safari, on a Mac, it opens the Music application to an Apple Music subscription page for an artist named "E-Code".

E-Code (Apple Music)

The question "How do they generate ecode …" is so unclear that I do not know whether it refers to this artist, or to some sort of gift card code that would pay for an Apple Music subscription or an Apple TV subscription.

If it refers to the latter, then obviously part of "how do they generate" would involve a secret that only Apple knows, to prevent someone from counterfeiting codes and stealing services without paying for them.

Not sure where you got an eCode. With the promotions provided by Apple, it is automatically added to your Apple ID, there is no code to enter.

Unfortunately, thrice repeating the same question probably isn’t going to advance this.

Some guesses about what you might mean:

Here is how to set up Apple Music on other devices: Play Apple Music with Alexa - Apple Support

here is how to redeem a gift card: How to redeem your Apple Gift Card or App Store & iTunes gift card - Apple Support

Here is how to buy a gift card: Apple Gift Card - Apple

If you have some other question about music and Apple TV and an “ecode”, please provide a little background.

Other guesses include getting scammed on a website by purchasing some fake code or finding one of the many sites that claim they have free codes, just so they get the clicks. Unfortunately we just don't know and the details seem to be lacking.

Not sure what code you are asking about. Do you have any more details on what you are trying to accomplish.