They are no longer accepting credit cards because their merchant service provider stopped allowing overseas transactions without the card physically present due to high levels of credit card fraud from the US and Australia.
Of course, in the US we are cautioned against bank and wire transfers because of the high levels of fraud with those transactions. sigh :)
{ WEBMASTER EDIT } June 7, 2023: The following response was provided by Welsh Dragon Tours to help clarify a few things:
We have been trading as a Visit Wales listed inbound operator since 2005, when we launched Welsh DragonTours. Perhaps it would be useful to read some of our client reviews, that include post pandemic submissions, up to 2023. It is unfortunate that our MS provider, after nearly two decades, made the unqualified decision to withdraw their provision. In the UK travel sector, we were not alone. One reply above mentions that a number of UK businesses are not accepting card transactions (CNP) from outside the UK., which is quite correct. In fact, issuers to certain sectors of business are withdrawing the facility generally, and Travel has been hard hit by this decision.
Whilst we appreciate that being unable to accept card payments may be inconvenient, we identify to all our clients the cost of IBT prior to taking deposits, and offer assistance to anyone who may not be familiar with the process, or have concerns surrounding this method of payment.