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React Native Stripe: Solving 'Ephemeral Key' & PaymentSheet Initialization Errors

  Few things in mobile development are as frustrating as a silent failure in a payments flow. You have followed the Stripe documentation, installed   @stripe/stripe-react-native , and set up your backend endpoint. Yet, when you call   initPaymentSheet , nothing happens, or you receive a cryptic error stating that the payment information could not be found. The culprit is almost always a mismatch in the "Holy Trinity" of the PaymentSheet: the  Customer ID , the  PaymentIntent , and the  Ephemeral Key . This guide dissects the root cause of these initialization errors, explains the strict relationship required between these three entities, and provides a production-ready implementation for both your Node.js backend and React Native frontend. The Root Cause: The Authorization Triangle To render a saved card or allow a user to save a new one, Stripe's mobile SDK requires a temporary "pass" to modify the customer's data directly from the device. This is the...