Here are the quick steps at getting your 7shifts schedule synced with your Google Calendar.
Step 1: Go to Schedules > Sync
Step 2: Copy the URL for your schedule
Step 3: Paste the URL into your Google Calendar
You should now see your schedule on your Google Calendar.
Follow the next few steps if you want the calendar to appear on your iPhone. NOTE: If you have another device, please follow the instructions here that are provided by Google.
Step 4: From your phone, go to this link: www.google.com/calendar/iphoneselect
Step 5: Select your work calendar from that screen, and click Save.
There you have it! Your schedule should now be pulled into your mobile calendar.