Czechia

Invitation form: Czech authorities often provide an official “Invitation form” (Pozvání) that your partner in Czechia can get notarized or approved by the Czech Foreign Police. While not mandatory for every case, having this official invitation can help if your partner is sponsoring your stay. If you don’t have it, a personal invitation letter from your partner with copies of their Czech ID is still acceptable.

Relationship evidence: Include proof of your relationship (photos together, call/chat histories, etc.), especially if you label your trip as “visiting boyfriend/girlfriend”. The Czech visa officers will want to see that your relationship is genuine, but avoid overloading – pick a few strong pieces of evidence.

Financial & ties: Show you have enough money for the trip or that your partner will cover costs. Czech visas are typically straightforward if finances are clear (bank statements, sponsorship letter if needed) and you demonstrate solid reasons to return to Thailand (e.g. employment, family). They’re not known to be overly strict, but they will refuse if they doubt your return plans, so cover those bases.