Payment terminal fulfillment involves several key aspects: installing necessary software and encryption keys, handling initial orders and modifications, cancellations, returns, maintenance, and dealing with stock shortages. Fulfillment centers must be able to configure terminals for specific payment processors. Merchants may change or cancel orders at different stages, so the fulfillment process must account for orders with resellers, fulfillment centers, in transit, or already shipped. Further details on all fulfillment issues are available on Paylosophy.