curl --request POST \
  --url https://api.metronome.com/v1/contract-pricing/rate-cards/addRates \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "rate_card_id": "d7abd0cd-4ae9-4db7-8676-e986a4ebd8dc",
  "rates": [
    {
      "product_id": "13117714-3f05-48e5-a6e9-a66093f13b4d",
      "starting_at": "2020-01-01T00:00:00.000Z",
      "entitled": true,
      "rate_type": "FLAT",
      "price": 100,
      "pricing_group_values": {
        "region": "us-west-2",
        "cloud": "aws"
      }
    },
    {
      "product_id": "13117714-3f05-48e5-a6e9-a66093f13b4d",
      "starting_at": "2020-01-01T00:00:00.000Z",
      "entitled": true,
      "rate_type": "FLAT",
      "price": 120,
      "pricing_group_values": {
        "region": "us-east-2",
        "cloud": "aws"
      }
    }
  ]
}'

{
  "data": {
    "id": "d7abd0cd-4ae9-4db7-8676-e986a4ebd8dc"
  }
}