Hi Jason,
That requires toolkit/API from the blockchain you want to connect wallets to.
It’s beyond the scope of the theme as this is basically software development and knowledge in how blockchain’s smart contract work (Solana has POH).
Like how Cardano requires knowledge in Haskell and usage of their PAB (plutus application backend) on top of knowledge in JS, HTML and CSS.
I’m not even sure WordPress has this. If a WordPress site has one, the part that communicates w/ the wallet is likely custom developed.