UInterchangeUserDefinedAttributesAPI::CreateUserDefinedAttribute

Create user defined attribute with a value and a optional payload key param UserDefinedAttributeName - The name of the user defined attribute param Value - The value of the user defined attribute param PayloadKey - The translator payload key to retrieve the [FRichCurve](API\Runtime\Engine\Curves\FRichCurve) animation for this user defined attribute note - User defined attributes are the DCC translated node user custom attributes (i.e. Maya extra attributes) Payload key will point on a [FRichCurve](API\Runtime\Engine\Curves\FRichCurve) payload.