Как исправить ошибку: не удается найти символ импорта com.stripe. android .TokenCallback;

Question

package com.example.androidstripepayments;
import androidx.appcompat.app.AppCompatActivity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;



import com.parse.FunctionCallback;
import com.parse.ParseCloud;
import com.stripe.android.Stripe;

import com.stripe.android.TokenCallback;
import com.stripe.android.model.Card;
import com.stripe.android.model.Token;
import java.text.ParseException;
import java.util.HashMap;

//import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    public static final String PUBLISHABLE_KEY = "pk_test_qeSW2ZpZCFBZe0";
    private Card card;
    private ProgressDialog progress;
    private Button purchase;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        card = new Card(
                "4242424242424242", //card number
                12, //expMonth
                2030,//expYear
                "123"//cvc
        );
        progress = new ProgressDialog(this);
        purchase = (Button) findViewById(R.id.purchase);
        purchase.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                buy();
            }
        });
    }

    private void buy(){
        boolean validation = card.validateCard();
        if(validation){
            startProgress("Validating Credit Card");
            new Stripe(this).createToken(
                    card,
                    PUBLISHABLE_KEY,

У меня возникли проблемы с этой строкой прямо здесь с TokenCallback (). И я не знаю, как заменить этот метод другим методом, чтобы он работал. Каждый раз, когда я компилирую код, я всегда получаю ту же ошибку. TokenCallback всегда выделено красным. Это также не позволяет мне использовать библиотеку. Эта библиотека, кажется, больше не работает по какой-либо причине.

                    new TokenCallback() {
                        @Override
                        public void onError(Exception error) {
                            Toast.makeText(MainActivity.this,
                                    "Stripe -" + error.toString(),
                                    Toast.LENGTH_LONG).show();
                        }

                        @Override
                        public void onSuccess(Token token) {
                            finishProgress();
                            charge(token);
                        }
                    });
        } else if (!card.validateNumber()) {
            Toast.makeText(MainActivity.this,
                    "Stripe - The card number that you entered is invalid",
                    Toast.LENGTH_LONG).show();
        } else if (!card.validateExpiryDate()) {
            Toast.makeText(MainActivity.this,
                    "Stripe - The expiration date that you entered is invalid",
                    Toast.LENGTH_LONG).show();
        } else if (!card.validateCVC()) {
            Toast.makeText(MainActivity.this,
                    "Stripe - The CVC code that you entered is invalid",
                    Toast.LENGTH_LONG).show();
        } else {
            Toast.makeText(MainActivity.this,
                    "Stripe - The card details that you entered are invalid",
                    Toast.LENGTH_LONG).show();
        }
    }

    private void charge(Token cardToken){
        HashMap<String, Object> params = new HashMap<String, Object>();
        params.put("ItemName", "test");
        params.put("cardToken", cardToken.getId());
        params.put("name","Dominic Wong");
        params.put("email","dominwong4@gmail.com");
        params.put("address","HIHI");
        params.put("zip","99999");
        params.put("city_state","CA");
        startProgress("Purchasing Item");
        ParseCloud.callFunctionInBackground("purchaseItem", params, new FunctionCallback<Object>() {
            public void done(Object response, ParseException e) {
                finishProgress();
                if (e == null) {
                    Log.d("Cloud Response", "There were no exceptions! " + response.toString());
                    Toast.makeText(getApplicationContext(),
                            "Item Purchased Successfully ",
                            Toast.LENGTH_LONG).show();
                } else {
                    Log.d("Cloud Response", "Exception: " + e);
                    Toast.makeText(getApplicationContext(),
                            e.getMessage().toString(),
                            Toast.LENGTH_LONG).show();
                }
            }
        });
    }

    private void startProgress(String title){
        progress.setTitle(title);
        progress.setMessage("Please Wait");
        progress.show();
    }
    private void finishProgress(){
        progress.dismiss();
    }
}

это build.gradle (Project :) Я почти уверен, что добавил все нужные зависимости

   // Top-level build file where you can add configuration options common to all sub-    projects/modules.

    buildscript {

        repositories {
            google()
            jcenter()

        }
        dependencies {
            classpath 'com.android.tools.build:gradle:3.6.0'


            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }
    }

    allprojects {
        repositories {
            google()
            jcenter()

        }
    }

    allprojects {
        repositories {

            maven { url "https://jitpack.io" }
        }
    }

    task clean(type: Delete) {
        delete rootProject.buildDir
    }

Это мой build.gradle (модуль), я обязательно добавил сюда все нужные вещи.

    apply plugin: 'com.android.application'

    android {
        compileSdkVersion 29
        buildToolsVersion "29.0.3"

        defaultConfig {
            applicationId "com.example.androidstripepayments"
            minSdkVersion 19
            targetSdkVersion 29
            versionCode 1
            versionName "1.0"

            testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        }

        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            }
        }

    }

    ext {
        parseVersion = "1.23.1"
    }

    dependencies {
        implementation fileTree(dir: 'libs', include: ['*.jar'])

        implementation 'androidx.appcompat:appcompat:1.1.0'
        implementation 'com.google.android.material:material:1.1.0'
        implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
        implementation 'androidx.navigation:navigation-fragment:2.2.1'
        implementation 'androidx.navigation:navigation-ui:2.2.1'
        testImplementation 'junit:junit:4.12'
        androidTestImplementation 'androidx.test.ext:junit:1.1.1'
        androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
        // Stripe Package
        implementation 'com.stripe:stripe-android:+'
        implementation "com.github.parse-community.Parse-SDK-Android:coroutines:1.23.1"
        implementation 'com.parse.bolts:bolts-android:1.4.0'
        implementation 'com.squareup.okhttp3:logging-interceptor:3.8.1'

        implementation "com.github.parse-community.Parse-SDK-Android:parse:$parseVersion"
    }

    allprojects {
        repositories {
            maven { url "https://jitpack.io" }
        }
    }