fix(api): Modify return type of returns API to payment-transaction

feat(api): Add Payoff Details

Author: stainless-app[bot]

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 172
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/lithic%2Flithic-e1901db484e520cc1f6aa88c8b00d0fcda30c8f9e5ea562a12b9edfc3fb3b6d6.yml
-openapi_spec_hash: 59c317749628f3ed4cc7911b68f6351f
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/lithic%2Flithic-9791980619fc7ce8afb01f77dfe3c660a540975327378287cb666136ae4b0a99.yml
+openapi_spec_hash: 0752074b2a7b0534329a1e3176c94a62
 config_hash: aab05d0cf41f1f6b9f4d5677273c1600