Just for information on purchasing a reentry permit from Suvarnabhumi. The only documents needed are, ..completed TM 8 form with passport photo attached and payment. No longer require any photocopy of passport pages. Very quick service, took 15 mins.
TLDR : Answer Summary
Purchasing a reentry permit at Suvarnabhumi Airport only requires a completed TM 8 form with a passport photo attached and payment. Photocopies of passport pages are no longer needed, and the service is very quick, taking around 15 minutes.