Airline may ask for sight of return/onward ticket or, ‘some sort of visa’. Checking in online or at airport totems doesn’t avoid this risk as your airline can request this at the departure gate or if, transiting, when boarding your next flight leg.
Can sympathise! Excellent Pattaya Visa Agent obtained a Non-O Retirement Visa plus 12 months extension plus opened a Bangkok Bank savings account for me. It was conditional to buy 12 months Bangkok Bank Personal Accident Insurance. Only 3,000 baht and covered moto accidents providing you were under 65.
Those of us who live abroad have the same issue. You never know which way it could go. However, when you need the cash you need it and there’s no way of getting around that!
Similar to flying on a one-way ticket. The airport check-in desk sometimes asks for sight of return/onward ticket or ‘some sort of visa’ (their words to me). The next time I fly on the same route with the same airline they don’t?
Fine for not making a 90 day report is 2,000 baht. Same amount for one missed report or more than one. Immigration at air, land or sea borders are not concerned with 90 day reporting, only overstays.