If you believe you found a vulnerability in @nopeion/shopier, please do not open a public issue with exploitable details.

Report it privately by emailing nopeiondev@gmail.com with:

• a short description of the issue,
• affected package version,
• reproduction steps or proof of concept,
• impact assessment, if known.

You should receive an initial response within 72 hours. Valid reports will be handled with a fix, release notes, and a GitHub Security Advisory when appropriate.

• Never expose PATs, webhook tokens, or OSB passwords in frontend code.
• Only create PAT checkout flows and REST API calls on a trusted server.
• Keep .env files out of git and deployment logs.
• Treat Personal Access Tokens like passwords; rotate them if they are logged or shared.

• Always verify REST webhook or OSB signatures before delivering a product, credit, or entitlement.
• The SDK utilizes hardened JSON parsing by default. It actively filters __proto__, constructor, and prototype keys from incoming Webhook and OSB payloads, nullifying Prototype Pollution vectors.
• Treat invalid signatures as a hard failure.
• Make webhook and OSB processing idempotent. Shopier or the network may retry notifications.
• Use stable provider identifiers such as webhook id, Shopier order id, or OSB order id to prevent duplicate fulfillment.
• Return the literal success body only after OSB verification and your own fulfillment logic have safely completed.

This package helps create PAT-based checkout flows and verify Shopier REST webhook and OSB notifications. Application-level authorization, database transactions, product delivery, refunds, and account recovery remain the responsibility of the integrating application.