There are two steps you need to do in order to get your booking synced with your own calendars.
Step1. Get calendar Url.
Login to your Hakema account with your email address and password.
Goto Settings > Booking > Integrate Calendars > Click on the Copy button to copy the Url.
Now login to Google calendar or iCal or Outlook.
Step 2: Add the URL to your existing calendar
Go to Google Calendar.
Click on the down arrow next to Other Calendars on the left sidebar.
Select Add by URL.
Paste the Copied URL.
Click Add Calendar.
Email the Copied URL to yourself.
Open the email you sent to yourself containing the URL and select Copy.
Go to Home Screen > Settings > Mail, Contacts, Calendars > Add Account > Other > Add Subscribed Calendar
Paste the URL copied from your settings and tap Next.
Tap Save. Your iPhone will import your calendar immediately.
Open Outlook and go to your calendar.
Select Open Calendar → From the Internet.
Paste the URL copied from your settings into the box that pops up and press OK.
Click Yes. Outlook will import your calendar immediately.