ECPay Technology Launches an AI Skill! Developers can use AI to integrate payment flows, supporting tools such as Codex and Gemini.

Taiwan's ECPay Technology has released the ECPay API Skill documentation on GitHub. Developers can use AI tools like ChatGPT to access payment integration knowledge, directly generate code, and troubleshoot errors, effectively lowering the barrier to system integration.

Taiwan's payment service provider ECPay recently published the ECPay API Skill on GitHub, consolidating knowledge on API integrations for payments, logistics, electronic invoices, and ECTicket into Skill documents readable by AI development tools. This allows developers to directly assist in ECPay API integration within environments like OpenAI Codex CLI, Google Gemini CLI, ChatGPT GPTs, Claude Code, Cursor, GitHub Copilot CLI, and more.

According to the ECPay GitHub documentation, the current version of the ECPay API Skill is V3.2. The installation guides support three main entry points: ChatGPT GPTs use SKILL_OPENAI.md as the entry file; OpenAI Codex CLI uses AGENTS.md; and Google Gemini CLI uses GEMINI.md.

By adding the Skill to their project, developers enable AI tools to access the ECPay API knowledge base, assisting with code generation, error troubleshooting, parameter verification, and switching between test and production environments.

From "Reading Documentation" to "Asking AI": Lowering the Barrier to ECPay API Integration

In the past, developers integrating payment services often had to repeatedly consult API documentation, handling CheckMacValue validation, payment parameters, Webhook, error codes, invoice issuance, logistics integration, and other details. While familiar to experienced payment engineers, these processes could still pose challenges for teams new to integration, especially with environment setup, field formats, encryption signatures, or test MerchantID issues.

The core concept of ECPay API Skill is to convert these documents into a knowledge base that AI can understand and reference. Official documents even include validation examples, allowing developers to directly ask Codex or Gemini questions like: "What is the test MerchantID for ECPay AIO payment?" The expected answer would be 3002607.

Support for Payment, Logistics, Electronic Invoices, and ECTicket

ECPay API Skill offers comprehensive coverage. The core Knowledge Files listed in the ChatGPT GPTs build guide include AIO payment, on-site payment 2.0, behind-the-scenes authorization/number retrieval, B2C electronic invoices, CheckMacValue, AES encryption, error codes, Webhook, HTTP protocols, and multilingual integration.

Additional files cover beginner guides, B2B invoices, domestic logistics, comprehensive logistics, ECTicket, and cross-service scenarios. The official recommendation for GPT setup is to name it "ECPay ECPay Technology Integration Assistant," positioning it as "ECPay's official API integration consultant," supporting payment, logistics, electronic invoices, and ECTicket, with support for 12 languages.

This also elevates the ECPay API Skill from mere "document organization" to an AI API advisor that developers can build, deploy, and update themselves.

Integrate into Codex, Gemini, or Build Your Own ChatGPT GPTs

For Codex CLI and Gemini CLI, the official provides three methods: project-level installation, global installation, and Git Submodule. The recommended approach is project-level installation, where developers clone the GitHub repo into the project directory as .ecpay-skill, then reference the entry files in Codex's AGENTS.md or Gemini's GEMINI.md.

To create ChatGPT GPTs, upload SKILL_OPENAI.md, SKILL.md, and multiple guides files into Knowledge Files. The documentation notes that SKILL_OPENAI.md is a streamlined version tailored for GPT, and because it exceeds the token limit of the Instructions field, it should be uploaded directly to Knowledge. If there is a conflict with the full decision tree SKILL.md, SKILL_OPENAI.md takes precedence.

ECPay also recommends enabling Web Search for GPTs, to easily access the latest official specifications from developers.ecpay.com.tw.

• This article is reprinted with permission from: 《Chain News》
• Original title: "ECPay Launches AI Skill! Supports Codex, Gemini, ChatGPT, Developers Can Use AI to Connect Payment"
• Original author: Neo