Make a request to the Connect URL as shown in this example: 
curl --request POST \
  --url https://connect.flatpeak.com \
  --header 'Content-Type: application/json' \
  --data '{
  "connect_token": "<connect_token>",
  "route": "session_restore"
}'
The response will be one of the predefined pages (1 to 13) listed below and complete-a-session webhook. Your application must support handling all of these pages.