The IngestFeedAwsAuthenticationInput datatype includes a couple of settings.

Table: IngestFeedAwsAuthenticationInput

kindIngestFeedAwsAuthenticationKindyes The kind of AWS authentication to use. An enumerated list, but the only choice is IamRole.
roleArnstring  Arn of the role to be assumed.

[a] Some arguments may be required, as indicated in this column. For some fields, this column indicates that a result will always be returned for it.