I haven’t found any solutions online or with shopify support for getting my custom app installed on my client’s shopify account.
I have the generated link that I need to give the client, but the only parameters in the link are clientid and signature, with shopify support and documentation are unaware that the link now only includes those.
The app is PHP, and I know I need to include the API key and the API signature somewhere in the headers, but I found some old articles that didn’t work, and nothing seems to be current with a solution.
Any help or direction is much appreciated.