it sounds to me like it's a custom url scheme built into ios. https://developer.apple.com/documentation/uikit/inter-process_communication/allowing_apps_and_web

it sounds to me like it's a custom url scheme built into ios. https://developer.apple.com/documentation/uikit/inter-process_communication/allowing_apps_and_websites_to_link_to_your_content/defining_a_custom_url_scheme_for_your_app https://developer.apple.com/documentation/uikit/inter-proces...