After creating a Connect Element token, you can launch a Connect session in a webview.

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Initializing the Connect Element

The Connect Element is optimized to work within Webviews, including on iOS and Android. Open a webview in your app to your desired environment using the element_token you generated. Example: Using the Element SDK (recommended): 
method.open('pk_elem_BtzySdrQGFmLdAPw5gXSQNCxQkhCkT3K');
Without SDK: 
https://elements.production.methodfi.com/
  ?token=pk_elem_4PpMTPcchb49VBjwP3bREKhMN93hrQHR