There are 3 ways: 1) Webhook. You configure one for each Pix key, but you need to verify that Efí is the one calling you using mTLS. 2) GET /cob/:txid. When it's paid, there will be a [pix] object. 3) GET /pix with filter by initial time, end time and txid. If there is no object it is not paid yet.
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