Looks like no NWC yet, but it's a two-step process to zap in Amethyst, and I don't think it is possible in Primal on Android.
Discussion
Just use with Amethyst. It is the best FOSS combo.
Hey, Minibits dev here. NWC allows to control wallet living on remote server from another app over #nostr messages.
However with #minibits, your ecash stays only on your mobile device. Therefore you need the nostr client to support lightning: deeplinks and then open minibits app to confirm the payment.
NWC is nice but targets custodial wallets or selfhosted lightning nodes.