Retrieve a Mandate

curl --request POST \
  --url https://api.sand.getivy.de/api/service/mandate/retrieve \
  --header 'Content-Type: application/json' \
  --header 'X-Ivy-Api-Key: <api-key>' \
  --data '{
  "id": "<string>"
}'

{
  "id": "<string>",
  "referenceId": "<string>",
  "reference": "<string>",
  "signature": {
    "ip": "<string>",
    "token": "<string>",
    "signedAt": "2023-11-07T05:31:56Z"
  },
  "creditor": {
    "id": "<string>",
    "name": "<string>",
    "address": {
      "street": "<string>",
      "city": "<string>",
      "postalCode": "<string>",
      "country": "<string>"
    }
  },
  "debtor": {
    "account": {
      "iban": "<string>",
      "bic": "<string>",
      "accountHolderName": "<string>"
    }
  },
  "status": "pending",
  "revokedAt": "2023-11-07T05:31:56Z",
  "userNotificationEmail": "<string>"
}