This page gives the short answer first, then every step.

Short answer: Yes. Most things you can do in the app, you can do with the API: bank accounts, wallets, payees, checks, mailing, ACH, wires, payment links, and webhooks. The full list is below.

What you can do with the API

Most things you do in the app, you can do with the API. Here are the main groups of requests.

Bank accounts

Create, list, change, and delete bank accounts. Add a signature or a logo. Get the list of check designs. Check a routing number.

Bank account verification

Verify a bank account with micro deposits, or with an instant check.

Wallets

List your wallets and their transactions. Add money to a wallet. Withdraw money by ACH, wire, or mailed check. Move money between wallets.

Payees

Create, list, change, and delete payees. Add bank accounts to a payee.

Quick Pay

Do a payment in one request: create a check, an echeck, a mailed check, or a wire. Send ACH. Mail a PDF. Mail several checks in one envelope.

Checks

Create, list, change, delete, print, and void checks. Add attachments. Mark a check as posted.

Mail checks

See the mail options, work out the mailing fee, check an address, and track a mailed check.

Mail documents

Mail HTML or PDF documents. Upload documents. Save sender addresses. Track a mailed document.

Addresses

Save custom from addresses and custom to addresses.

Email checks

Create a check and send it by email.

Categories and vouchers

Create and list categories. Create, list, change, and delete vouchers.

ACH and Direct Deposit

Create a direct deposit and check its status.

Send payment

Send ACH, wire, instant (RTP), and mailed check payments. List the payments you sent.

Receive payment

Make payment links, add customers, and start manual ACH.

Pay from a credit card

List your cards and pay with a card.

Webhooks

Get a message on your own web page when something changes, such as a payment or a mailed check.

Where to see every request

Open apiv3.onlinecheckwriter.com. Pick a group on the left. Each request shows an example you can copy.

Common questions

Do I need a special account?

You need your API key from the Developer Panel. Before you go live, ask our support team to turn on the live API.

I need more help.

Call (408) 775-7720, use the chat box in the lower right corner of the app, or email support@onlinecheckwriter.com.

Pay your vendors with Online Check Writer

Want help? Book a demo. Our team will answer your questions.

This page gives general information. It is not legal advice.