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v.3.1.0
**What changed:** 1. Introduced a new configuration constant `INTENT_EXTRA_SHOW_RETRY_WHEN_FAILED` to control the visibility of the "Retry" button on the payment error screen. 2. Updated `PHMainActivity` to receive and pass this flag to the `PaymentResultFragment`. 3. Modified `PaymentResultFragment` to conditionally show or hide the retry button based on the provided intent extra (defaults to `true`). 4. Bumped SDK version from `3.0.19` to `3.1.0`.