@ζ³**
, There is nothing to do at the Thai embassy in another country to re-enter Thailand if you have a valid one of these, if you have:
- a multiple entry visa based on retirement (from embassy/consulate)
- Or 1-year extension based on being over 50 with multiple re-entry permit (from the local immigration office inside Thailand)
If you are on an extension but don't have re-entry permit, you have to apply for re-entry permit BEFORE you leave Thailand.