I am trying to build a Shopify offsite Payment extension and using this documentation. I am a partner along with the shopify and I am finding myself stuck after going through the first 2 steps in the documentation as I am not sure exactly how to proceed further. I am making a extension which my merchants will install on their stores so that they can pay using my checkout page. I am the payment provider as well so I process all the transaction from my backend which is java totally different API call. So how can I proceed with the configuration file of the extension.toml file and after that how would I proceed furter? The document confuses me a lot exactly.
