Integrating Crypto Wallets Seamlessly: A Developer's Guide to ETOPay SDK

As a developer in the fintech space, integrating crypto wallets into your mobile or web apps can be a daunting task—traditional methods often involve months of custom coding, compliance hurdles, and security implementations. ETOPay SDK changes that by offering a streamlined, EU-compliant solution that lets you add self-custody wallets, multi-factor authentication (MFA), backups, and seamless transactions in just days. In this guide, we'll walk through the integration process for iOS and Android, complete with code snippets, tips on wallet management, and a comparison to conventional approaches. Whether you're building an e-commerce app or a DeFi tool, ETOPay empowers you to focus on innovation rather than infrastructure.

Why Choose ETOPay SDK for Wallet Integration?

ETOPay provides a single SDK for iOS, Android, and web, backed by REST APIs and white-label options. Key features include:

  • Self-Custody Wallets: Users control their assets with built-in MFA and automated backups.
  • Compliance Built-In: GDPR-ready, automated tax calculations, and KYC flows.
  • Fast Integration: Pre-built components reduce setup time from months to days.
  • Customizable Dashboard: Configure payment methods, limits, and networks easily.

By leveraging ETOPay, developers can achieve up to 80% faster implementation compared to building from scratch.

Step-by-Step Integration Guide

The integration follows a simple three-step process, applicable to both iOS (using Swift) and Android (using Kotlin/Java). Start by logging into the ETOPay dashboard via GitHub for project setup.

1. Set Up Your Project in the Dashboard

After logging in with GitHub, create a new project. This generates your API keys and allows configuration of preferred plans, payment methods, KYC requirements, and transaction limits.

  • Navigate to the dashboard and select "Create Project."
  • Choose your preferred plan (details handled through secure payment processing).
  • Configure basics like payment methods and limits.

This step aligns with the dashboard's project management and payment setup configuration.

2. Integrate the SDK into Your App

Add the ETOPay SDK to your iOS or Android project. The SDK handles wallet logic, including user initialization and network settings.

For iOS (Swift):

import ETOPaySdk

// Initialize the SDK with configuration
let sdk = ETOPaySdk()
try await sdk.setConfig(config: configJSON)

For Android (Kotlin):

import com.etospheres.etopay.ETOPaySdk

// Initialize the SDK
val sdk = ETOPaySdk()
sdk.setConfig(configJSON)

This step provides the core logic for working with backend connectivity, as noted in the SDK overview.

3. Configure Settings and Launch Features

Use the SDK to set static configurations via JSON strings, user preferred networks, and initialize users. Then, launch wallet features.

Static configuration example (applicable to both platforms):

{
    "auth_provider": "your_auth_provider",
    "backend_url": "https://api-etopay.etospheres.com",
    "storage_path": "/path/to/storage",
    "log_level": "info"
}

Set user preferred network:

// Set the user's preferred blockchain network
try await sdk.setNetwork(network_key: "ethereum")

User initialization:

// Create and initialize user
try await sdk.createNewUser(username: "user123")
try await sdk.refreshAccessToken(access_token: "your_jwt_token")
try await sdk.initUser(username: "user123")

Launch wallet and payment features:

// Create wallet
let mnemonic = try await sdk.createNewWallet(pin: "1234")

// Process a payment
try await sdk.sendAmount(pin: "1234", address: "recipient_address", amount: 100.0, data: [])

For Android, the methods are similar, adapted to Kotlin syntax.

4. Implementing Wallet Management, MFA, and Backups

ETOPay's SDK includes complete wallet management with MFA (multi-factor authentication) and backups.

  • Wallet Management: Use self-custody features for secure storage with Shamir's Secret Sharing.
  • MFA Setup: Built-in pin and password protection for wallet operations.
  • Backups: Automated recovery options with mnemonic and backup file support.

KYC Integration:

// Start KYC verification with Postident
let caseResponse = try await sdk.startKycVerificationForPostident()
print("Case ID: \(caseResponse.case_id)")

// Or use Viviswap KYC
let viviswapUser = try await sdk.startKycVerificationForViviswap(
    mail: "user@example.com", 
    termsAccepted: true
)

This handles compliance flows without external redirects.

Tips for Successful Integration

  • Test in Sandbox: Use the dashboard to simulate transactions and verify MFA/backups.
  • Handle Edge Cases: If an empty value is provided for preferred network, the SDK resolves to a default.
  • Security Best Practices: Always use self-custody and MFA to mitigate risks.
  • Scalability: The REST API complements the SDK for high-volume apps.

Compared to traditional methods (e.g., building custom wallets with libraries like Web3.js), ETOPay cuts integration time dramatically—from 3-6 months of coding compliance and security to just days of configuration.

Conclusion: Accelerate Your Development with ETOPay

Integrating crypto wallets doesn't have to be complex. With ETOPay SDK, you get a robust, compliant solution that enhances user experience and speeds up time-to-market. Start today by visiting the dashboard and exploring the full potential.

Ready to integrate? Head to https://etospheres.com for API keys and more resources.

This is an article in our series exploring strategic approaches to Web3 authentication and compliance. Follow the ETOSPHERES blog and social media accounts for more insights on navigating the evolving regulatory landscape and crypto payment use-cases, while maximizing your competitive advantage through ETOSPHERES secure solutions.

ETOSPHERES is a modular Web3 service suite that combines EU-compliant data security with advanced digital wallet solutions. With a comprehensive service portfolio - from an advanced wallet SDK and Fiat On/Off-Ramp to billing and consent management, social features and AI-supported infrastructure - ETOSPHERES enables companies to seamlessly integrate user-oriented Web3 functions. Our unified interface provides a user-friendly interface for managing digital assets. Fully GDPR-compliant and developed in Germany, the platform offers scalable solutions for decentralized applications that revolutionize both customer loyalty and monetization.

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