It's really should be done by developer who know coding. We could not set up API if no idea about coding. You could search Google about API and it's function.
Haha a little confusing as you are practically repeated the same thing over again 3 times not to be rude as you are trying to help, API is simple yes I know still outside of coinbase or anything as I imagine exchanges do not use this API they have a source somewhere to intergrate directly into their website, still I think are you talking more abou this https://www.blockchain.com/api/blockchain_wallet_api correct as I see Blockchain offers Wallet Integration API for BTC, ETH and Bitcoin Cash so you helped me get closer to what I am looking for by being able to learn the correct wording for what I need which is Wallet Integration.