terraform resource aws_api_gateway_authorizer generated incorrect output

[rorourke-iot]

The resource aws_api_gateway_authorizer was generated as

resource "aws_api_gateway_authorizer" "<terraform id>" {
    rest_api_id = "<api id>"
    name = "<name>"
    type = "TOKEN"
    AuthType = "custom"
    authorizer_uri = "<auth uri>"
    identity_source = "method.request.header.Authorization"
    identity_validation_expression = "Bearer (.*)"
    authorizer_result_ttl_in_seconds = 300
}

AuthType is not a valid terraform argument for this resource. According to the docs, there doesn't appear to be a mappable equivalent.