From Turkish Airlines Miles and Smiles Elite Plus
To Garuda Miles Platinum

Sent an Email with status match request to garudamiles@garuda-Indonesia.com incl. following documents:
-Photo of my Elite Plus Card
-Miles Statement
-Tier matching order form completed (can be downloaded on Garuda website)
-Garuda Miles Membership Number
-Passport Copy

Result: 6 Month Platinum membership! Matching approval took 4 days!