Did you configure your snippet in the right way?
Something like this:
<upm-dac order-config-url="https://my.myupmindbrand.com/order/product" currency-code="USD" ></upm-dac>
Sure it will be possible, but why is this not integrated yet after 2 years?
It is very important to have iDeal and SEPA payments I guess. I see this requested a lot.
Can you give us please a honest estimate? So we can decide if we ditch WHMCS?