curl --request POST \
  --url https://api.interchange.io/api/v2/storefront/esa/{esaId}/buyer-advertiser-mappings \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "operatorDomain": "<string>",
  "gamAdvertiserId": "<string>"
}
'

{
  "id": "<string>",
  "operatorDomain": "<string>",
  "gamAdvertiserId": "<string>",
  "createdAt": "<string>",
  "updatedAt": "<string>",
  "brandHouse": "<string>",
  "brandId": "<string>",
  "principalId": "<string>"
}