This version begins using Browser Custom Tabs for loading Bank OAuth pages securely. Custom Tabs are a secure way of opening web traffic as the browser tab is not under direct control of the app so secrets can't be stolen from e.g. bank login webpages, unlike with WebViews where the app can inject code to allow access to anything on the page.
Since OAuth flows are no longer handled within a WebView, completion handling can no longer be captured internally by the SDK and thus the OAuth integration steps mentioned in the docs are now absolutely critical - previously we recommended completing these steps anyway for future proofing, but now they are mandatory. Please contact your MoneyKit technical partner if you are having any difficulties with the steps described in the docs and we will be happy to help you.