Open this in Golf in Hand
This link is for the Golf in Hand app on your phone.
You've been invited to a game
Open Golf in Hand, tap Have a code? and type:
If Golf in Hand is on this phone
Go back to the message and tap the link again, and choose Golf in Hand if your phone asks what to open it with.
If it isn't
Ask whoever sent you this how to get Golf in Hand, then come back to the link.