Help & guides / Google Calendar
Setup guide
Every booking appears in your Google Calendar automatically, and anything already in your calendar blocks that time on your website.
Time: about 20 minutes
You need: the Google account that owns your calendar
You'll copy: 3 codes
Once connected, your website adds every new booking to your Google Calendar, moves it if the booking is rescheduled, and blocks out times you're already busy so clients can't book them.
Google needs you to set up a small, free, private “project” in Google Cloud. Only you will ever see it. At the end you'll have three codes: an OAuth Client ID, an OAuth Client secret and your Calendar ID.
Have your website address ready. You'll need it in step 5. It looks like yourbusiness.nunkio.com, or your own domain if you have one.
1
Go to console.cloud.google.com and sign in with the Google account that owns your calendar. Click the project picker at the top, then New project, name it Nunkio Booking and click Create. Make sure the new project is selected, search for Google Calendar API and click Enable.
2
Search for Google Auth Platform and open it. If you see Get started, click it and choose External. Under Branding fill in the app name, your support email, an authorised domain (nunkio.com, or your own domain) and your developer contact email. Click Save.
3
Click Data Access → Add or remove scopes. At the bottom, under Manually add scopes, paste https://www.googleapis.com/auth/calendar, click Add to table, then Update, then Save. Skipping this is the most common reason Google shows “Something went wrong”.
4
Click Audience. Leave the publishing status on Testing; you don't need to publish. Under Test users click + Add users, enter your Gmail address and click Save.
5
Click Clients → + Create client, choose Web application and name it Nunkio WP. Under Authorised redirect URIs add this address, using your own website address, then click Create:
https://yourbusiness.nunkio.com/wp-admin/admin.php?page=nunkio-settings&tab=google
6
A pop-up shows your Client ID and Client secret. Copy both now. Google only shows the secret once; if you lose it, open the client and click Add secret to make a new one.
7
In Google Calendar, hover over the calendar you want bookings in, click ⋮ → Settings and sharing, scroll to Integrate calendar and copy the Calendar ID. Your main calendar's ID is usually your Gmail address. Tip: create a separate “Bookings” calendar if you'd like to keep them apart.
8
Go to Nunkio Booking → Settings → Google Calendar, tick Enable Google Calendar, paste the three codes and click Save settings. Then click Connect Google Calendar, choose your account, click Continue if Google says the app isn't verified (that's normal for your own private app), and click Allow. You'll see “Connected”.
Error 400: redirect_uri_mismatch
The address in step 5 doesn't match your website exactly. Fix it in Clients, save, wait 5 minutes and try again.
Error 403: access_denied
Your Gmail address isn't a test user. Add it under Audience → Test users (step 4).
“Something went wrong” on Google's page
The calendar permission is missing. Do step 3 again and make sure you clicked Update and Save.
Lost the Client secret
Open your client, click Add secret, paste the new one into your website and save.
Want the PDF with screenshots? If you have a Nunkio website, you'll find all the PDF guides in your account on nunkio.com or inside your plugin dashboard. Still stuck? Email support@nunkio.com. Please never send us your Client secret.
