We're still working on this but progress is currently stalled because Apple will sometimes reject apps if they have payments code in them but they don't collect payments, so we need to add the ability to include optional modules only sometimes before we launch this.
In the meantime, you'll just have to detach and do it yourself, unfortunately. I would look at Naoufal's payments library for this right now. https://github.com/naoufal/react-native-payments