ephemeralKey property
Ephemeral key secret for customer-scoped operations (saved payment methods).
The native SDK only reads this from the top level of the props map; the nested Configuration.customer object is ignored, so set it here.
Android only. iOS SDK 0.7.x builds the top-level props itself and gives a wrapper SDK control over the configuration object alone, so there is no way to supply this on iOS. See the "Platform differences" section of the README.
Implementation
String? ephemeralKey;