Bulk Payment API for Developers

Build Bulk Payment Workflows Into Your Product

Connect vendor, contractor, supplier, and business-payment workflows to your application with the OnlineCheckWriter.com bulk payment API. Give your product a clear path to supported payment methods without building every payment workflow from the ground up.

Explore API Documentation Book a Demo

OnlineCheckWriter.com, powered by Zil Money, is a financial technology company and not a bank. Banking services are provided by our partner bank, Member FDIC. FDIC insurance applies only to eligible products associated with those that have funds held in accounts at the partner bank, subject to applicable limits and requirements.

// create a bulk payment batchconst batch = await ocw.payments.createBatch({  source: "your-app",  payments: [    { payee: "Vendor 014", method: "ach" },    { payee: "Supplier 208", method: "check" }  ]});

Bulk Payment Batch 3 payees

VVendor 014 ACH Completed

SSupplier 208 Check Processing

CContractor 052 Wire Queued

One API, Multiple Payment Methods

Send ACH, checks, wires, and virtual cards from a single integration

The OnlineCheckWriter.com bulk payment API gives your application one connection point for the payment methods businesses already use. Add a method without rebuilding your payment layer.

ACH payments

Move bank-to-bank payments to vendors, contractors, and suppliers in bulk batches.

Checks

Print or mail checks programmatically so paper payees stay inside the same workflow.

Wires

Trigger wire payments for higher-value business transactions through the same API.

Virtual cards

Issue virtual cards for controlled, single-use, or vendor-specific spending.

What You Can Build

A bulk payment API built for real business-payment workflows

Stop stitching together separate tools for payouts, approvals, and tracking. Use one API to add mass payments to the product your customers already work in.

Mass vendor payouts

Submit hundreds of payments in one batch instead of pushing them through one at a time.

Accounts payable automation

Connect your AP workflow to payments so approved bills move out without manual entry.

Contractor and supplier payments

Pay 1099 contractors and suppliers their way, by ACH, check, or wire, from one call.

Multi-method disbursements

Let each payee choose how they get paid while your code keeps using one request shape.

Payee management

Create and reuse payee records so repeat payments do not start from scratch each time.

Status tracking

Pull payment status back into your product so your team and customers stay informed.

How It Works

Go from approved payments to a sent batch in three steps

Connect your application

Authenticate your app to the OnlineCheckWriter.com API and map your payees to payment records.

Create a bulk batch

Send one request with many payments. Set the method per payee, by ACH, check, wire, or virtual card.

Track every result

Read status updates for each payment in the batch and surface them inside your own product.

Built for Developers

A clean, batch-first API your team can ship on

The bulk payment API is structured around how businesses actually pay: many payees, multiple methods, and clear status back. Your engineers integrate once and reuse it across products.

Submit large payment batches in a single request
Choose the payment method at the payee level
Create and reuse payee and payment records
Read clear status for every payment in a batch
Keep payments inside your own product experience

// submit a bulk payment batch
const batch = await ocw.payments.createBatch({
  source: "your-app",
  payments: [
    { payee: "Vendor 014",     method: "ach" },
    { payee: "Supplier 208",   method: "check" },
    { payee: "Contractor 052", method: "wire" }
  ]
});

// read status back into your product
const status = await ocw.payments.getBatch(batch.id);

Use Cases

Teams that put bulk payments inside their product

If your application touches business payments, the bulk payment API gives you a path to send them without building the payment rails yourself.

Platforms and marketplaces

Pay sellers, drivers, and creators on schedule, in volume, from inside your platform.

Accounts payable teams

Turn approved invoices into outbound payments without rekeying data into another tool.

Contractor and gig payouts

Disburse to many 1099 workers at once and let each one keep their preferred method.

Property management

Send owner draws, vendor payments, and refunds across many properties in one batch.

Insurance and claims

Pay claimants and adjusters by the method that fits each case from a single workflow.

Field service and franchises

Reimburse crews and locations on a recurring cycle without manual one-by-one entry.

Security and Compliance

Move business payments on a platform built for trust

OnlineCheckWriter.com, powered by Zil Money, is used by businesses to handle payments at scale. Your integration runs on the same platform.

PCI-DSS ISO 27001 ISO 20000 Payee record controls Status visibility per payment

FAQ

Bulk payment API questions, answered

What is the OnlineCheckWriter.com bulk payment API?

It is an API that lets your application send many business payments in a single batch. You connect your product once, submit a batch of payments with a method set per payee, and read status back. It is built for vendor, contractor, supplier, and business-payment workflows.

Which payment methods does the API support?

The API covers ACH, checks, wires, and virtual cards. You choose the method at the payee level, so one batch can mix methods based on how each recipient prefers to be paid.

Can I send many payments in one request?

Yes. The API is batch-first. Instead of pushing payments one at a time, you submit a list of payments in a single batch request and track each one from the same place.

How do I track the status of payments?

You read the status of each payment in a batch through the API and surface it inside your own product, so your team and your customers can see where a payment stands.

Who should use the bulk payment API?

Developers and product teams at platforms, marketplaces, accounts payable tools, property management software, and any business that needs to pay many vendors, contractors, or suppliers from inside their application.

How do I get started?

Review the API documentation to see the request structure, then book a demo with our team to walk through your use case and the methods you want to support.

Start Building

Add bulk payments to your product

Connect vendor, contractor, supplier, and business-payment workflows to your application with the OnlineCheckWriter.com bulk payment API.