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Summary
The Galoy backend API already supports an optional memo field when creating a lightning invoice, but the frontend interface didn't yet have a memo field. This pull request adds an optional memo field and allows users to send memos to each other over lightning invoices.
How it works
The new memo input field lives on the [username] page and passes the memo data to the ReceiveAmount and RecieveNoAmount components. The RecieveNoAmount component passes that memo information to a modified gql mutation which receives a lightning payment request from the backend. The RecieveAmount component passes the memo information to the GenerateInvoice component which generates a lightning invoice containing that memo information.
The memo input has been tested with US-ASCII characters, Korean characters, Chinese characters, and emojis, and has been able to encode memo data into lightning invoices.