feat: Make blockchain recipient account_token nullable

Author: stainless-app[bot]

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 214
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/lithic/lithic-70848844b69f7905307f9986b5630160aee26497cdbaf9257839a088ae7ca00b.yml
-openapi_spec_hash: a5d37fbb60eba858c8bd2ebe982936e1
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/lithic/lithic-9829c574c7a227436f0828b64037e25825704e2d26115ec48750affcdb2bf0e0.yml
+openapi_spec_hash: c5c6cbb7b3b9d1e4663844122b5d6012
 config_hash: f6d04d790aaddf639fc04b7f0092e7ec

src/lithic/types/blockchain_recipient.py

@@ -14,8 +14,11 @@ class BlockchainRecipient(BaseModel):
     token: str
     """A globally unique identifier for this blockchain recipient"""
 
-    account_token: str
-    """The financial account the blockchain recipient belongs to"""
+    account_token: Optional[str] = None
+    """
+    The financial account the blockchain recipient belongs to, or null when the
+    recipient is registered against the program rather than a financial account
+    """
 
     address_tag: Optional[str] = None
     """