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Search our knowledge base or browse setup guides across invoicing, accounts payable, inventory tracking, and REST API integration.
Search filters the guide categories below.
Create & Dispatch First Invoice
Pick or add a customer, add line items and tax rates, and dispatch an invoice with a shareable client link.
Record Received Payment
Log manual payments (Bank Transfer, Wire, UPI, Cash) to reconcile balances and transition invoice status.
Log Vendor Bills & POs
Record supplier purchase orders and bills to monitor outstanding payables and your net recorded spread.
Send Estimates & 1-Click Convert
Build client proposals and convert approved estimates directly into active invoices in a single click.
Set Organization Branding
Upload your company logo, configure default currency, and set static manual payment instructions.
Knowledge Base Categories
Step-by-step guides organized by workflow domain.
Create, send, schedule, and convert commercial invoices and quotes.
Track vendor obligations, purchase orders, and supplier bills.
Configure manual payment instructions and reconcile bank statements.
Monitor warehouse inventory, reorder thresholds, and adjustment logs.
Log billable hours, project kanban milestones, and retainers.
Set up multi-business workspaces, team access roles, and branding.
Developer Docs & REST API Reference
Automate invoice dispatch, vendor bill ingestion, and outbound webhook delivery.
Every request requires an authorized Bearer token or API key, plus an explicit organization header to ensure multi-tenant boundary isolation:
Receive HTTPS POST payloads signed with HMAC-SHA256 headers when commercial events trigger (invoice.sent, bill.created).
curl -X POST https://api.wilbill.in/api/v1/invoices \
-H "Authorization: Bearer <your_access_token>" \
-H "x-org-id: org_c87a21f0" \
-H "Content-Type: application/json" \
-d '{
"customerId": "cust_39b014",
"issueDate": "2026-10-03",
"dueDate": "2026-11-02",
"currency": "USD",
"items": [
{
"description": "Backend API Security Remediation",
"quantity": 1,
"unitPrice": 2400.00
}
]
}'