fix(types): make cardholderCurrency optional in CardProgram

Author: stainless-app[bot]

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 194
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/lithic/lithic-c2235aace63c72401c7a2830da84bf7b5ab4006916595790243e23d9d7aa6727.yml
-openapi_spec_hash: 6ba55a7b55799ac4a311043a0f21d7ac
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/lithic/lithic-659808bfd15f4eafd418ec0db871b22be857ca94f771c9539792ecda2d2d0dbe.yml
+openapi_spec_hash: e870e6403121ac3bbd1667deec6788de
 config_hash: 1c5c139a2aa0d1d45c063f953a9bc803

lithic-java-core/src/main/kotlin/com/lithic/api/models/CardProgram.kt

@@ -342,8 +342,14 @@ private constructor(
         }
 
         /** 3-character alphabetic ISO 4217 code for the currency of the cardholder. */
-        fun cardholderCurrency(cardholderCurrency: String) =
-            cardholderCurrency(JsonField.of(cardholderCurrency))
+        fun cardholderCurrency(cardholderCurrency: String?) =
+            cardholderCurrency(JsonField.ofNullable(cardholderCurrency))
+
+        /**
+         * Alias for calling [Builder.cardholderCurrency] with `cardholderCurrency.orElse(null)`.
+         */
+        fun cardholderCurrency(cardholderCurrency: Optional<String>) =
+            cardholderCurrency(cardholderCurrency.getOrNull())
 
         /**
          * Sets [Builder.cardholderCurrency] to an arbitrary JSON value.