curl --request GET \
  --url https://api.barker.money/api/partner/products/{slug}/position \
  --header 'X-Api-Key: <api-key>'

{
  "success": true,
  "data": {
    "wallet_address": "0x1234567890123456789012345678901234567890",
    "product_slug": "acme-usdc-base",
    "shares": "10287.456789012345678901",
    "assets": "10500.123456",
    "usd_value": "10500.12"
  }
}