I'm wondering, at Chaeng Wattana, can you pay the 1,900 baht extension of stay by credit card as I've only seen people handing over cash only? If so, do they add a surcharge?

No

No way and no play

Cash only.

that is why you have an ATM in front of all "official office"....= Cash only !    

Cash only. 

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your kidding right to charge 1900 Bht for extension Wow

2 hours ago, TheFishman1 said:

your kidding right to charge 1900 Bht for extension Wow

Yes. It's very cheap isn't it? 

Cheap it is compared to having to exit and re-enter.

Actually there is or was a big sign to the right of the entrance, saying that CW now accepts credit cards. Since I always pay in always pay in cash, I didn't read the sign too carefully. Here's what the website says about accepting payment of fees and fines by debit/ credit card:

http://www.immigration.go.th/nov2004/en/base.php?page=readmore&id=1323&section=news

11 minutes ago, gjoo888 said:

Actually there is or was a big sign to the right of the entrance, saying that CW now accepts credit cards. Since I always pay in always pay in cash, I didn't read the sign too carefully. Here's what the website says about accepting payment of fees and fines by debit/ credit card:

http://www.immigration.go.th/nov2004/en/base.php?page=readmore&id=1323&section=news

That notice was "posted on 3 Dec 2012" . It never happened.