curl --request POST \
  --url http://localhost:8000/api/v1/google-ads/migrations/apply \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "donor_campaign": "<string>",
  "recipient_campaign": "<string>",
  "donor_cost_per_conv": 123,
  "recipient_cost_per_conv": 123,
  "cost_per_conv_difference_percent": 123,
  "z_score": 123,
  "recommended_migration_amount": 123,
  "donor_metrics": {
    "conversions": 123,
    "current_budget": 123,
    "impression_share": 123,
    "abs_top_page_rate": 123,
    "visibility_score": 123
  },
  "recipient_metrics": {
    "conversions": 123,
    "current_budget": 123,
    "impression_share": 123,
    "abs_top_page_rate": 123,
    "visibility_score": 123
  }
}
'

{
  "success": true,
  "donor_campaign": {
    "name": "<string>",
    "old_budget": 123,
    "new_budget": 123
  },
  "recipient_campaign": {
    "name": "<string>",
    "old_budget": 123,
    "new_budget": 123
  },
  "migration_amount": 123,
  "message": "<string>"
}