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The process to modify and retrieve the dictionary type in Swift using Firebase Custom token is as follows:

1. Generate a custom token using the Firebase Admin SDK. The custom token should contain the necessary user data in the form of a dictionary.

2. Use the custom token to authenticate the user in your Swift application.

3. Once the user is authenticated, retrieve the data from Firebase Realtime Database using the Firebase Database SDK for Swift.

4. Modify the dictionary as required.

5. Use the Firebase Database SDK to update the data in Firebase Realtime Database.

Here's some sample code to demonstrate the process:

// Generate a custom token using the Firebase Admin SDK and pass the user data as dictionary
let customToken = FirebaseApp.app()?.auth().createCustomToken(userID, claims: userDataDictionary)

// Authenticate the user using the custom token 
Auth.auth().signIn(withCustomToken: customToken) { (authResult, error) in
  if let error = error {
    // Handle the error
    return
  }

  // Retrieve the data from Firebase Realtime Database
  let ref = Database.database().reference(withPath: "path/to/data")
  ref.observeSingleEvent(of: .value, with: { (snapshot) in
    // Get the data as a dictionary
    var myData = snapshot.value as? [String: Any] ?? [:]

    // Modify the data as required
    myData["key"] = "new value"

    // Update the data in Firebase Realtime Database
    ref.setValue(myData)
  }) { (error) in
    // Handle the error
  }
}

Note: Ensure that you have configured Firebase correctly in your Swift application and have the necessary Firebase SDKs installed.