Problem Description When calling Alipay EasySDK using PHP, after filling in the parameters according to the official code, an error message was reported during operation: "Undefined...

Alipay PHP...

H5. The main difference between mini programs and APP is: technical architecture: H5 is based on web technology, and mini programs and APP are independent applications. Experience and functions: H5 is light and easy to use, with limited functions; mini programs are lightweight and have good interactiveness; APPs are powerful and have smooth experience. Compatibility: H5 is cross-platform compatible, applets and APPs are restricted by the platform. Development cost: H5 has low development cost, medium mini programs, and highest APP. Applicable scenarios: H5 is suitable for information display, applets are suitable for lightweight applications, and APPs are suitable for complex functions.

H5 development tools recommendations: VSCode, WebStorm, Atom, Brackets, Sublime Text; Mini Program Development Tools: WeChat Developer Tools, Alipay Mini Program Developer Tools, Baidu Smart Mini Program IDE, Toutiao Mini Program Developer Tools, Taro.

The choice of H5 and applet depends on the requirements. For applications with cross-platform, rapid development and high scalability, choose H5; for applications with native experience, rich functions and platform dependencies, choose applets.

There are differences in the promotion methods of H5 and mini programs: platform dependence: H5 depends on the browser, and mini programs rely on specific platforms (such as WeChat). User experience: The H5 experience is poor, and the mini program provides a smooth experience similar to native applications. Communication method: H5 is spread through links, and mini programs are shared or searched through the platform. H5 promotion methods: social sharing, email marketing, QR code, SEO, paid advertising. Mini program promotion methods: platform promotion, social sharing, offline promotion, ASO, cooperation with other platforms.

The best cryptocurrency trading and analysis platforms include: 1. OKX: the world's number one in trading volume, supports multiple transactions, provides AI market analysis and on-chain data monitoring. 2. Binance: The world's largest exchange, providing in-depth market conditions and new currency first-time offerings. 3. Sesame Open Door: Known for spot trading and OTC channels, it provides automated trading strategies. 4. CoinMarketCap: an authoritative market data platform, covering 20,000 currencies. 5. CoinGecko: Known for community sentiment analysis, it provides DeFi and NFT trend monitoring. 6. Non-small account: a domestic market platform, providing analysis of linkage between A-shares and currency markets. 7. On-chain Finance: Focus on blockchain news and update in-depth reports every day. 8. Golden Finance: 24 small

10 top scams on cryptocurrency exchanges Common scams: fake exchanges, Ponzi capital trading, contract manipulation, fake coin phishing, customer service fraud, etc. Identification points: Check regulatory licenses, check contract addresses, and be wary of high-yield commitments Must be protected: Use only mainstream exchanges (Binance/Coinbase) Enable hardware wallet Reject share private key/verification code Deal with fraud: take screenshots immediately, freeze assets, report on the platform, and report to the police Core principle: Any request for password/transfer is a fraud!