Copy this JSON object below. It has descriptive "<arrow-symbols>" to clearly identify the segments that need to be replaced.
{
"properties": {
"principalId": "<your-principal-id>",
"principalTenantId": "<your-principal-tenantId>",
"roleDefinitionId":
"/providers/Microsoft.Billing/billingAccounts/<your-billing-
accountId>/billingRoleDefinitions/<billing-role-definitionId>"
}
}