TMRW is not affiliated with Lightspark. Our UMA integration is not yet complete, we're ironing out the details. But overall it seems to be a burdened version of LNURL. The currency exchange bits are good. But the compliance stuff and VASP whitelisting makes for a less than ideal user experience as it often leads to payment rejections. It remains to be seen if these will be sorted out and if demand for it will grow.