You can use my nubank account for beta test
Will be glad to help
I’m thrilled that @nubank has selected @Lightspark to bring the Bitcoin Lightning Network and UMA (Universal Money Addresses) via the @umastandard to its platform and customers. Now working with the Nubank team on the integration. Vamos! https://www.lightspark.com/news/nubank-announcement ⚡ 
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