Technology That Powers Smarter Payments

Security at PaySec operates on the principle of defense in depth — no single layer is solely responsible for protecting cardholder data. Our end-to-end encryption begins at the point of interaction, where a DUKPT-derived unique key encrypts the card data before it leaves the terminal hardware. The encrypted payload traverses our network in an AES-256 envelope, decrypted only within our PCI-validated hardware security modules (HSMs) at the processor boundary.

Tokenization replaces sensitive card numbers with format-preserving tokens that retain the last four digits and BIN range for operational use but carry zero cryptographic relationship to the original PAN. These tokens are vault-scoped, meaning they cannot be used outside your merchant account even if intercepted. Our fraud screening engine processes over 200 signals per transaction — including device fingerprinting, behavioral biometrics, geographic velocity, and cross-merchant consortium data — to generate a risk score within 50 milliseconds. Merchants can configure threshold rules, automatically decline high-risk transactions, or trigger step-up authentication via 3D Secure 2.0 without adding friction to trusted customers.

Our compliance infrastructure undergoes annual third-party audits by a PCI Qualified Security Assessor, and all penetration testing results are available to enterprise merchants under NDA. Key management follows a split-knowledge, dual-control ceremony with HSM-generated keys that never exist in plaintext outside tamper-evident hardware. For merchants handling sensitive healthcare or government payment data, we offer dedicated tenant isolation with customer-managed encryption keys (CMEK) and detailed audit logging that satisfies HIPAA and FedRAMP Moderate control families.

Our API follows REST conventions with predictable resource-oriented endpoints, consistent error formatting, and idempotency keys on all mutating operations to prevent duplicate charges during network retries. Every response includes a trace ID that correlates across our distributed system, enabling support teams to diagnose issues in minutes rather than days. SDKs for Node.js, Python, PHP, and Ruby handle authentication, request signing, retry logic, and webhook signature verification out of the box.

Webhook events are delivered with at-least-once semantics and include a cryptographic HMAC-SHA256 signature header so your application can verify authenticity without additional API calls. Events cover the full transaction lifecycle — from authorization and capture through settlement, refund, and dispute — along with account-level events such as batch close, funding deposit, and compliance alerts. For high-volume merchants processing over 100,000 transactions daily, our batch processing endpoint accepts CSV or JSON file uploads, validates the entire file atomically, and returns per-row results via a polling or callback mechanism, allowing ERP systems to submit large settlement files without maintaining persistent connections.

Our sandbox environment mirrors production behavior with deterministic test card numbers, simulated decline scenarios, and time-travel capabilities for testing settlement and funding cycles without waiting days. API versioning follows a date-based scheme with 18-month deprecation windows, so integrations are never broken by platform updates. Rate limiting is generous at 1,000 requests per second per merchant, with burst capacity negotiable for enterprise accounts running flash sales or high-concurrency checkout flows. Comprehensive API documentation includes interactive request builders, code samples in all supported languages, and a changelog feed that notifies developers of new features and upcoming deprecations.