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Functionality, endpoints and fields marked as Conditional may be required in some cases for regulatory compliance (for example, if these are made available to the USERuser/CUSTOMER customer in the ASPSP's existing Online Channel, or if ASPSPs (or a subset of ASPSPs) have been mandated by a regulatory requirement).
For functionalities and endpoints:

• An ASPSP must implement functionality and endpoints marked as Conditional if these are required for regulatory compliance

For fields:

• All fields that are not marked as Mandatory are Conditional

• An AISP/PISP may specify the value of a Conditional field

• An ASPSP must process a Conditional field when provided by the AISP/PISP in an API request and must respond with an error if it cannot support a particular value of a Conditional field

An ASPSP must include meaningful values for Conditional fields in an API response if these are required for regulatory compliance.

YAML - Ain’t Markup Language . (abbreviated YAML) is a human friendly, cross language, unicode based data serialization language designed around the common native structures of agile programming languages. It is broadly useful for programming needs ranging from configuration files to Internet messaging to object persistence to data auditing.