types property
A field with each type of withdrawal supported for that asset as a key. Each type can specify a fields object explaining what fields are needed and what they do. Anchors are encouraged to use SEP-9 financial account fields, but can also define custom fields if necessary. If a fields object is not specified, the wallet should assume that no extra fields are needed for that type of withdrawal. In the case that the Anchor requires additional fields for a withdrawal, it should set the transaction status to pending_customer_info_update. The wallet can query the /transaction endpoint to get the fields needed to complete the transaction in required_customer_info_updates and then use SEP-12 to collect the information from the user.
Implementation
Map<String, Map<String, AnchorField>?>? types;