Generate Transfers API and TransferWebhooks models

[gcatanese]

PR to generate the Transfers API and TransferWebhooks models.

Transfers API

• In UltimatePartyIdentification add fundingInstrument attribute
• In BankAccountV3 add storedPaymentMethodId attribute
• In Transfer, TransferData and TransferEvent add add enum ReasonEnum.SCHEMEADVICE

Transfer Webhooks

• In BankAccountV3 add storedPaymentMethodId attribute
• In TransferEvent and TransferData add add enum ReasonEnum.SCHEMEADVICE

All models have been updated to handle the nullable value (Mustache templates have been updated as part of #1603)

[gemini-code-assist]

Summary of Changes

Hello @gcatanese, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the data models for the Transfers API and Transfer Webhooks. It introduces a new FundingInstrument model and integrates it into UltimatePartyIdentification, while also adding storedPaymentMethodId to BankAccountV3. Furthermore, it expands the ReasonEnum for transfer-related models with a new SCHEMEADVICE option. A broad underlying change is the implementation of explicit null serialization across many models, which improves the robustness and predictability of API interactions by clearly indicating when optional fields are intentionally set to null.

Highlights

• New FundingInstrument Model: A new FundingInstrument model has been introduced to represent the source of funds for transfers, including details like card identification, network payment reference, and source of funds type.
• Enhanced UltimatePartyIdentification: The UltimatePartyIdentification model now includes a fundingInstrument attribute, allowing for more detailed specification of the ultimate party's funding source.
• BankAccountV3 Update: The BankAccountV3 model has been updated to include a storedPaymentMethodId attribute, providing a unique token for identifying stored bank account details for payouts.
• Expanded Transfer Reasons: The ReasonEnum within the Transfer, TransferData, and TransferEvent models has been extended with a new value: SCHEMEADVICE, to cover additional transfer scenarios.
• Explicit Null Serialization: Numerous models across both the Transfers API and Transfer Webhooks have been updated to explicitly handle null values during JSON serialization. This involves adding isSet flags for each attribute and a getExplicitNulls() method, ensuring consistent API behavior when dealing with optional fields.

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[gemini-code-assist]

Code Review

This pull request introduces a mechanism for handling nullable fields during JSON serialization across a large number of model classes, which is essential for PATCH-like API operations. This is achieved by adding isSet... flags for each property and a getExplicitNulls() method that leverages Jackson's @JsonAnyGetter. The changes are consistent and appear to be auto-generated, which is appropriate for this kind of widespread modification. The overall approach is sound. I've included a few minor suggestions to improve efficiency by pre-sizing HashMap instances in the generated getExplicitNulls() methods, which could be beneficial if these objects are instantiated frequently.

[gcatanese]

@galesky-a I have rebased with main to confirm:

• API models include the nullable handling
• Webhook models no longer include the nullable handling
• other changes in Webhooks (javadoc, enum) are still geneated