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Grand Central unified APIs define a vendor-neutral contract between the Backbase Engagement Banking Platform and connectors. Each connector implements one or more of these specifications. You use the same interface for each capability, no matter which core banking system or third-party vendor the connector uses. Select a card to open the documentation for a unified API service. Each service page shows endpoints, request and response schemas, and example payloads. The Latest CalVer release tracks the grandcentral-api-bom snapshot. Each API in that release has its own specification version. If an API did not change from the previous BOM, Latest keeps the same OpenAPI file. The service cards open the latest CalVer for each API. To open an earlier CalVer, select a service card, then choose the CalVer from the drop-down list. Use the sidebar to browse APIs in each domain. Older releases include fewer services. Some APIs, for example Cross Channel Customer Workbench, appear only in later CalVer releases.
When you select Try it on a service page, the call goes to the live playground mock for that API’s major version. The mock does not use a snapshot of the CalVer you selected. Responses are sample data. They can differ from the examples on an older CalVer page.

Activity Management

Activity tracking and management APIs.

Batch Payment service

Batch payment processing APIs.

Card Ecommerce Gateway API

Card ecommerce gateway and authentication APIs.

Card Operations Management API

Card operations and device administration APIs.

Card Wallet API

Card authorization and wallet APIs.

Correspondence

Correspondence and document signing APIs.

Deposit service

Deposit account APIs.

Direct Debit Mandate API

Direct debit mandate APIs.

Grand Central Investment Portfolio API

Investment portfolio analysis APIs.

Cross Channel Customer Workbench API

Cross-channel customer workbench APIs. Available from CalVer 2026.08.

Loan service

Loan account APIs.

Location Data Management

Location and address data APIs.

Market Order Service API

Market order and wholesale trading APIs.

Message Management

Message management APIs.

Party Access Entitlement service

Party access entitlement APIs.

Party lifecycle service

Identity verification, onboarding, and customer screening APIs.

Party Reference Service

Party reference data APIs.

Payment Order Service

Payment order APIs.

Position Keeping API

Position keeping and account statement APIs.

Product Matching

Product matching and eligibility APIs.

Risk Detection Service

Fraud and risk detection APIs.

Servicing Consent

Servicing consent APIs.

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Available API domains

Each API domain lists the unified API artifact and the connector docs for implementations of that API.
API: grandcentral-activity-apiCreate, search, and update customer and employee activities.Implemented by: CRM connectors (Salesforce Connector)
API: grandcentral-batch-payment-apiCreate and cancel payment batches in one operation. Use batch payments for high-volume cases such as payroll, vendor transfers, and reimbursements.Implemented by: batch payment connectors (OBPM Batch Connector, Alacriti Batch Connector)
APIs: grandcentral-device-administration-api, grandcentral-card-authorization-api, grandcentral-card-ecommerce-gateway-apiManage card lifecycle, digital-wallet eligibility and provisioning, and 3-D Secure authentication.Implemented by: card management connectors (Tietoevry Connector, FIS Cardbase Connector)
API: grandcentral-correspondence-apiCreate document signing requests and signing-session URLs for e-signature workflows.Implemented by: KYC/KYB connectors (DocuSign Connector)
API: grandcentral-customer-workbench-apiManage cross-channel user preferences for the customer workbench. Available from CalVer 2026.08.
API: grandcentral-deposit-apiRun deposit account operations that follow the unified deposit contract.Implemented by: core banking connectors
API: grandcentral-direct-debit-mandate-apiSearch, retrieve, and terminate direct debit mandates. The API supports offset and cursor-based pagination.Implemented by: payments connectors (OBPM Connector)
API: grandcentral-fraud-detection-apiEvaluate fraud risk during account opening and transaction processing. The API response includes risk scores. The riskIndicators field lists matched fraud signals. The decisionFlag field gives the vendor-recommended action (Allow, Block, Challenge, or Quarantine).Implemented by: fraud detection connectors (Feedzai Connector, BioCatch Connector)
API: grandcentral-financial-instrument-reference-data-management-apiReturn intraday and close-day price observations for financial assets, including bulk latest-intraday lookups. Available from CalVer 2026.07. This API is not on the Latest service cards. To open it, select any service card, choose 2026.07 from the drop-down list, then open the specification in the sidebar.
API: grandcentral-investment-portfolio-analysis-apiReturn portfolio allocations, assets under management (AUM), and performance metrics such as time-weighted rate of return. Available from CalVer 2026.07.
API: grandcentral-loan-apiRun loan account operations, including balances and transaction history.Implemented by: core banking connectors
API: grandcentral-location-data-management-apiProvide address autocomplete and address metadata for US and international addresses. Banks use the metadata to validate address input.Implemented by: address verification connectors (Smarty Connector)
API: grandcentral-market-order-apiInitialize, place, and cancel broker market orders. Retrieve order options for an asset. Available from CalVer 2026.07.
API: grandcentral-message-apiImport, update, and search messages such as notifications or alerts for customers and employees. Available from CalVer 2026.06.
API: grandcentral-party-reference-apiCreate, retrieve, and update party records for customers and businesses. The isCustomer field (from the party-reference API response) marks customer parties. The API also supports beneficiary verification.Implemented by: core banking connectors, CRM connectors (Salesforce Connector, Dataverse Connector)
API: grandcentral-party-access-entitlement-apiControl party access permissions for related accounts.Implemented by: core banking connectors (Fiserv DNA Connector)
API: grandcentral-party-lifecycle-apiManage identity verification and customer onboarding. You can create applicants, get identity verification results, download documents, and screen customers against global watchlists. Watchlists cover sanctions, politically exposed persons (PEPs), adverse media, and anti-money laundering (AML). The API also supports Confirmation of Funds (CoF) consent management.Implemented by: KYC/KYB connectors (ComplyAdvantage Connector, Onfido Connector, Prove Connector)
API: grandcentral-party-reference-apiInbound party reference connectors use the same OpenAPI to keep party fields such as email address, phone number, and postal address in sync.Implemented by: core banking connectors (inbound)
API: grandcentral-payment-order-apiManage the payment lifecycle: initiation, validation, status retrieval, fee calculation, bank details lookup, standing orders, and scheduled payments. The v2 specification aligns with ISO 20022. It adds remittance information, regulatory reporting, foreign exchange (FX) contract tracking, and structured address formats.Implemented by: payments connectors (OBPM Connector, Alacriti Connector, SurePay Connector, Temenos Payments Hub Connector)
API: grandcentral-position-keeping-apiRetrieve account statements and statement transactions. Accept transaction enrichment batches. Sync Hub delivers enrichment results. Available from CalVer 2026.07.Implemented by: financial data aggregation connectors (SaltEdge Connector, Plaid Connector)
API: grandcentral-product-matching-apiRun eligibility checks that match financial products to a party.Implemented by: core banking connectors
To download an OpenAPI specification, open the page menu on an endpoint page and select Download API spec.