curl --request POST \
  --url https://api.interchange.io/api/v2/buyer/discovery/{discoveryId}/products \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "products": [
    {
      "productId": "product_123",
      "salesAgentId": "agent_456",
      "groupId": "ctx_123-group-0",
      "groupName": "Publisher Name",
      "bidPrice": 12.5,
      "budget": 5000,
      "pricingOptionId": "po_abc123"
    }
  ]
}
'

{
  "discoveryId": "<string>",
  "products": [
    {
      "productId": "<string>",
      "salesAgentId": "<string>",
      "selectedAt": "<string>",
      "groupId": "<string>",
      "groupName": "<string>",
      "cpm": 123,
      "budget": 123
    }
  ],
  "totalProducts": 0,
  "budgetContext": {
    "sessionBudget": 123,
    "allocatedBudget": 123,
    "remainingBudget": 123,
    "budgetWarning": "<string>"
  }
}