If you need to do a Facebook Domain Verification, you have two possibilities:

If the ticketshop is on your own domain, use the DNS method, by adding the needed value to your DNS
If the ticketshop is on *.shop.secutix.com
1. go to Organization → Initialization → Sales channels → your ticketshop → Points of sales → your point of sale → Theme → Advanced
2. Create a new entry with key config.head.custom.tags, and put the value of the meta tag in it, like for example:
  <meta name="facebook-domain-verification" content="xxx" />
3. Wait 10 minutes, to be sure the key is synced to the Ticketshop
4. Do the verification with Facebook
5. Remove the meta key from the point of sales

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