Unknown parameter in input: "BillingMode"

My old DynamoDB script that works:

{
    "AttributeDefinitions": [
        {
            "AttributeName": "userId",
            "AttributeType": "S"
        }
    ],
    "TableName": "DEV_Users",
    "KeySchema": [
        {
            "AttributeName": "userId",
            "KeyType": "HASH"
        }
    ],
    "ProvisionedThroughput": {
        "ReadCapacityUnits": 1,
        "WriteCapacityUnits": 1
    }
}

My two attempts at updating this script to work for on-demand:

{
    "AttributeDefinitions": [
        {
            "AttributeName": "userId",
            "AttributeType": "S"
        }
    ],
    "TableName": "TEMP_Users",
    "KeySchema": [
        {
            "AttributeName": "userId",
            "KeyType": "HASH"
        }
    ],
    "BillingMode": "PAY_PER_REQUEST"
}

And also

{
    "AttributeDefinitions": [
        {
            "AttributeName": "userId",
            "AttributeType": "S"
        }
    ],
    "TableName": "TEMP_Users",
    "KeySchema": [
        {
            "AttributeName": "userId",
            "KeyType": "HASH"
        }
    ],
    "BillingModeSummary": [
		{
			"BillingMode ": "PAY_PER_REQUEST"
		}
    ]
}

Both attempts result in:

Parameter validation failed:
Missing required parameter in input: "ProvisionedThroughput"
Unknown parameter in input: "BillingMode", must be one of: AttributeDefinitions, TableName, KeySchema, LocalSecondaryIndexes, GlobalSecondaryIndexes, ProvisionedThroughput, StreamSpecification, SSESpecification

Am I doing anything wrong? Looks like I am complying with the create-table CLI? https://docs.aws.amazon.com/cli/latest/reference/dynamodb/create-table.html