curl --request GET \
  --url https://api.sandbox.nevermined.app/api/v1/protocol/plans/{planId} \
  --header 'Authorization: Bearer <token>'

{
  "planId": "<string>",
  "name": "<string>",
  "description": "<string>",
  "priceConfig": {
    "priceType": "FIXED_PRICE",
    "tokenAddress": "<string>",
    "amounts": [
      123
    ],
    "receivers": [
      "<string>"
    ]
  },
  "creditsConfig": {
    "creditsType": "FIXED",
    "amount": 123,
    "minAmount": 123,
    "durationOfThePlan": 123
  },
  "isListed": true,
  "owner": "<string>"
}