Related Clues:
- Security request, briefly
- Proof at the door
- Certain stamp of approval
- Globetrotter's purchase
- Traveler's entry document
- Common way to charge
- Addition to passport not altogether advisable
- Stamp in passport
- Addition to passport
- Endorsement allowing bearer to enter country
- Travel permit stamped in passport etc
- Proof of personal details
- Travel stamp in passport
- Driver's license, often
- Embassy issuance