Four API calls to first payment

SlyncPay handles the Wingspan complexity so you don't have to. Onboard contractors, create payables, and trigger disbursements with a clean REST API.

01

Sign up and get your API key

Create an account, connect a bank account for your first entity, and receive your live API key in under 5 minutes. No contracts, no setup fees.

POST /v1/auth/signup
{
  "companyName": "Acme Staffing",
  "email": "[email protected]",
  "plan": "starter"
}
// → { "apiKey": "spk_live_..." }
02

Onboard your first contractor

POST one API call with your contractor's name and email. SlyncPay sends them a branded W-9 collection and bank account setup flow. You get a webhook when they're ready to be paid.

POST /v1/contractors
Authorization: Bearer spk_live_...

{
  "externalId": "nurse-jane-001",
  "email": "[email protected]",
  "firstName": "Jane",
  "lastName": "Smith"
}
// → Wingspan account created. W-9 invite sent.
03

Create payables as work happens

Every shift, project, or milestone creates a payable. Attach it to the correct legal entity for proper 1099 tracking. Use your own reference IDs — SlyncPay maps them for you.

POST /v1/payables
Idempotency-Key: shift-9021-payment

{
  "contractorId": "{{jane_id}}",
  "entityId": "{{az_entity_id}}",
  "externalReferenceId": "SHIFT-9021",
  "lineItems": [
    { "description": "ICU shift 4/19", "quantity": 1, "unitAmount": 450 }
  ]
}
04

Trigger disbursement — one call, all contractors

When you're ready to pay, one POST sweeps all pending payables for an entity into a payroll batch. Contractors get paid. Your webhook fires when each payment settles.

POST /v1/disbursements
Idempotency-Key: az-batch-2026-04-19

{
  "entityId": "{{az_entity_id}}"
}
// → 14 contractors paid. Total: $24,500.
// webhook: disbursement.completed

Built for production from day one

Every SlyncPay feature is designed for the correctness requirements of real payroll.

Multi-entity, multi-EIN

Each of your legal entities gets its own Wingspan sub-account. Payables are attributed to the correct EIN, so 1099s are accurate without any manual reconciliation.

Idempotent by design

Every write operation accepts an Idempotency-Key header. Re-send the same request safely — SlyncPay returns the original response without re-issuing payment.

Webhooks with HMAC verification

Every outgoing webhook is signed with your endpoint's secret key. Verify the SlyncPay-Signature header to ensure events aren't spoofed.

1099-NEC auto-filing

At year-end, SlyncPay generates and e-files 1099-NEC forms for every contractor earning $600+, organized by entity. No spreadsheets, no manual uploads.

Instant onboarding links

GET /contractors/:id/onboarding-link returns a fresh Wingspan session URL for any contractor. Embed it in your app or send it directly.

Test mode built in

Every account gets both live and test API keys. The test environment mirrors production with fake Wingspan staging data — no real money moves.

Ready to integrate?

Get your API key in 5 minutes. 14-day free trial. No credit card required.

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