Generate Authentication Token

curl -X POST "https://api-sandbox.88pay.io/api/auth/token" \
  -H "x-api-key: sk_test_a1b2c3d4e5f6g7h8" \
  -H "x-merchant-id: MCH-COL-TEST-12345"

class TokenManager {
  constructor(apiKey, merchantId, baseUrl) {
    this.apiKey = apiKey;
    this.merchantId = merchantId;
    this.baseUrl = baseUrl;
    this.token = null;
    this.sessionId = null;
    this.expiresAt = null;
  }
  
  async getToken() {
    // Return cached token if still valid (with 10s safety margin)
    if (this.token && this.expiresAt && Date.now() < this.expiresAt - 10000) {
      return {
        access_token: this.token,
        session_id: this.sessionId
      };
    }
    
    // Generate new token
    const response = await fetch(`${this.baseUrl}/api/auth/token`, {
      method: 'POST',
      headers: {
        'x-api-key': this.apiKey,
        'x-merchant-id': this.merchantId
      }
    });
    
    if (!response.ok) {
      throw new Error(`Token generation failed: ${response.status}`);
    }
    
    const data = await response.json();
    
    // Cache token (expires in 60s, we cache for 50s)
    this.token = data.data.access_token;
    this.sessionId = data.data.session_id;
    this.expiresAt = Date.now() + 50000; // 50 seconds
    
    return {
      access_token: this.token,
      session_id: this.sessionId
    };
  }
}

// Usage
const tokenManager = new TokenManager(
  process.env.EIGHTY_EIGHT_PAY_API_KEY,
  process.env.EIGHTY_EIGHT_PAY_MERCHANT_ID,
  'https://api-sandbox.88pay.io'
);

// Get token (will cache automatically)
const { access_token, session_id } = await tokenManager.getToken();

// Later... (within 50 seconds, same token is returned)
const { access_token: token2, session_id: sid2 } = await tokenManager.getToken();