Payment routing engines evaluate incoming transactions in real time based on Card BIN, issuing country, currency, and merchant category code (MCC) before routing to the optimal acquiring partner.
Decline Handling and Cascading Logic
Soft Declines: Retryable issues such as Code 51 (Insufficient Funds) or Code 91 (System Timeout) trigger smart retry loops or automated secondary PSP cascading without customer friction.
Hard Declines: Terminal rejections like Code 04 (Pick Up Card), Code 41 (Lost Card), or Code 43 (Stolen Card) terminate processing immediately to avoid card testing penalties.
Silent Failover: Seamlessly transfers transactions to alternate acquiring rails when latency spikes or soft declines occur.