feat(api): api update (#674)

Author: stainless-app[bot]

.stats.yml

@@ -1,2 +1,2 @@
 configured_endpoints: 201
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-03ee97dd9c89c89eb1cc9ac40a7f757b3c92e262889d3ad2e654a03259026f44.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-6cc3e4ac223759041f330390923fab4098db3de30668152712a863fa81b40849.yml

increase-java-core/src/main/kotlin/com/increase/api/models/Transaction.kt

@@ -18761,8 +18761,8 @@ private constructor(
         ) {
 
             /** The account on which the interest was accrued. */
-            fun accruedOnAccountId(): Optional<String> =
-                Optional.ofNullable(accruedOnAccountId.getNullable("accrued_on_account_id"))
+            fun accruedOnAccountId(): String =
+                accruedOnAccountId.getRequired("accrued_on_account_id")
 
             /**
              * The amount in the minor unit of the transaction's currency. For dollars, for example,