[Lightning-dev] How to use LN

[v e]

Hi,

I am building merchant app and consumer wallet app using
https://bitcoinj.github.io APIs for wallet creation. Now I want to use LN
built by your team. I am looking at this API
https://github.com/ElementsProject/lightning-charge

and have few questions:

* Do i need to run bitcoin core node?
* I see invoice apis, I assume that the invoice is generated at the
merchant wallet app. How do i tie the merchant wallet to the invoice?

* similarly how do i send coins from consumer wallet to the created invoice?

Sorry I am very new to this and apologize my assumptions.

Any help is highly appreciated.
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