tender for supply of gst return filing and compliance services for indian railways , asp & gsp portal: provisioning, operation and maintenance of internet-based asp & gsp platf orm, hosting infrastructure, databases, gstn integrations, dashboards, reports, reconciliation utilities, data processing facilities, storage, backup, security controls and train-the-trainer sessions as specified under th e sor. ] , onsite/offsite support (technical/domain): technical support, gst domain support, gst retu rn filing coordination, helpdesk services, user assistance, onsite deployment (as and when required), trainin g support and gst compliance support services as specified under the sor. ] , volume based transactions: gst transaction processing, validations, gstn submissions and a ssociated processing activities as specified under the sor. ]