API Reference
DayZero REST API
A predictable, resource-oriented API for advisory firms and scaling businesses. Manage transactions, invoices, bills, journal entries, reconciliations, and financial reports — with cursor pagination, consistent errors, and ready-to-run code samples on every endpoint.
Quick start
All requests require a Bearer token in the Authorization header and a x-business-id header naming the target business. See the authentication guide for token issuance.
curl 'https://api.ondayzero.com/api/v1/businesses' \
-H 'Authorization: Bearer dz_your_token' \
-H 'x-business-id: YOUR_BUSINESS_ID'Endpoints by resource
Accounting dimensions
Accounting periods
Manage fiscal periods (month/quarter/year) and period locks.
Activation
Advisory firm entity groups
Advisory firm reports
Cross-client reporting for advisory firms.
Advisory firm teams
Team management within advisory firms — assign staff to teams and manage client access.
Advisory firm templates
Advisory firms
Advisory firm management for multi-tenant accounting.
AI chat public
AI reporting
Anomalies
AI-powered anomaly detection for unusual transactions and patterns.
AP approval
Accounts payable approval workflows for bill review and authorization.
API clients
API tokens
Create, list, and revoke Bearer API tokens.
AR subledgers
Attention
Automation runs
Bank deposits
Billing
Subscription billing, plan management, and usage tracking.
Bills
Accounts payable — create and manage vendor bills.
Budgets
Financial budgets and forecasts with variance tracking.
Businesses
Business entities — the core tenant in DayZero.
Catalog items
Categorization profile
Cfo portal
Cfo projection
Change orders
Client messages
Messaging between advisory firms and their clients.
Close verification
Consolidated reports
Contractors
Contracts
Counterparty aliases
Counterparty defaults
Counterparty naming
Credit
Partner credit lines — programs, lines, card settlements, loans, daily accrual, statements, payoff quotes, payments, underwriting and versioned scorecards, card issuing, and the credit event feed. DayZero keeps the ledger and measures; the partner moves the money and makes the lending decision.
Credit memos
Customer credits that can be applied to invoices.
Customer statements
Customers
Customer records for invoicing and AR.
Daily brief
Dashboards
Dashboards public
Deals
Decisions
Deferred revenue
Delayed charges
Document requests
Documents public
Estimates
Expense reports
Fixed assets
Asset tracking, depreciation schedules, and disposal.
Fx rates
Gmail
Intents
Intercompany cleanup
inventory:accounts_payable
inventory:activity
inventory:adjustments
Inventory quantity and value adjustments.
inventory:cost_history
inventory:counts
inventory:forecast
inventory:import
Bulk import inventory data from CSV or external systems.
inventory:landed_cost_allocations
inventory:ledger_settings
inventory:locations
Warehouse and storage location management.
inventory:lots
inventory:payments
Payments linked to inventory orders.
inventory:po_import
inventory:production
Production orders and bill-of-materials management.
inventory:products
Product catalog with SKUs, costs, and variants.
inventory:reorder
inventory:reports
inventory:shipments
Inbound and outbound shipment tracking.
inventory:standard_costs
inventory:supply_chain
inventory:transfer_suggestions
inventory:transfers
Inter-location inventory transfers.
Invitations
Invoices
Accounts receivable — create, finalize, and track invoice payments.
Journal entries
Double-entry bookkeeping with balanced debit/credit lines.
Ledgers
Chart of accounts — asset, liability, equity, revenue, and expense accounts.
Loans
Managerial key mappings
MCP connections
Meta ads
Month end packages
Notes
Internal notes attached to businesses and entities.
Notification preferences
Manage email and in-app notification settings.
Notifications
O2C webhooks
OAUTH
OAuth 2.0 authorization code flow for third-party integrations.
OAUTH grants
Onboarding
User and business onboarding workflows.
Orders
Orders esign
Payment advisory
AI-powered payment recommendations and cash flow optimization.
Payment terms
Net payment terms (Net 30, Due on Receipt, etc.).
Payroll
Pending changes
Posting defaults
Projects
Purchase orders
Purchase requisitions
Quickbooks
Reconciliations
Bank statement reconciliation with AI-assisted matching.
Recurring
Recurring invoice and bill templates with auto-generation.
Reports
Financial report generation (P&L, Balance Sheet, Trial Balance, etc.).
Revenue schedules
Sales receipts
Search
Full-text search across transactions, contacts, and entities.
Subscriptions
Manage recurring subscription billing for customers.
Tags
Custom tag groups and tags for categorizing entities.
Tax
Tax rate configuration and tax calculations.
Time entries
Todos
Transaction clarifications
Transactions
Bank transactions — sync, categorize, review, and reconcile.
User
User profile and preferences.
Vendor bill requests
Vendor bill requests public
Vendor contracts
Vendor contract tracking with renewal alerts and spend analysis.
Vendor credits
Vendors
Vendor management — accounts payable counterparties.
For AI agents
- /llms.txt — short index for LLM ingestion
- /llms-full.txt — full plain-text reference
- OpenAPI 3.1 spec — machine-readable schema
- Every endpoint page exposes a markdown variant at
{path}.mdand a per-endpoint OpenAPI slice at{path}/openapi.json.