Overview

MassPay supports physical check disbursements to payees across the US. Checks are printed and mailed by our fulfillment partner and can be customized with your brand identity - logo, letter copy, and return address. This guide covers everything required to configure and launch your check program.

Each check is structured in two parts:

‍Letter section (top 2/3rds of the page) - a branded letter addressed to the payee explaining the purpose of the payment
Check stub (bottom 1/3rd) - the negotiable instrument with MICR line, amount in words, payee name, and authorized signature

Design Assets Required

In addition to the data file, the following brand materials must be provided before your first check run.

Asset	Specifications	Accepted Format
Logo	Appears on the letter header and check stub (top-left). High resolution required.	PNG (300 DPI+) or EPS/SVG
Return Address	Sender name and mailing address printed on the letter and envelope.	Plain text
Letter / Detail Copy	Custom message in the top 2/3rds above the check stub. Supports personalization tokens.	Plain text or HTML
Authorized Signature	Printed in the 'Authorized By' field on the check stub.	PNG (300 DPI, transparent background)

4a. Letter / Detail Copy

The letter occupies the top two-thirds of the printed page, above the detachable check stub. It is addressed to the payee and explains the purpose of the payment.

Your letter copy should include:

Salutation addressed to the payee by name (personalization token available)
Clear explanation of why the check is being issued (refund, rebate, incentive, etc.)
Instruction to detach the check and present to their bank for deposit or cash
Void notice: checks will be voided if not cashed within 180 days of issuance
Closing with your team name and a support phone number or email address

Example Letter

Dear [Payee Name],

You are receiving this check as payment in the amount of $[Amount].

To access these funds, simply detach the check below and present it to your bank to deposit or cash.

Please be advised that this check will be voided if not cashed or deposited within 180 days of issuance.

Sincerely, [Client Company Name]

4b. Logo Specifications

Your letter copy should include:

Salutation addressed to the payee by name (personalization token available)
Clear explanation of why the check is being issued (refund, rebate, incentive, etc.)
Instruction to detach the check and present to their bank for deposit or cash
Void notice: checks will be voided if not cashed within 180 days of issuance
Closing with your team name and a support phone number or email address

4c. Authorized Signature

PNG format with transparent background.
300 DPI minimum resolution.
Black ink on white or transparent background.
Avoid overly complex signatures with fine hairlines.

Check Layout Reference

All client-branded checks follow the standard layout below.

Zone	Content
Top-left header	Your logo + return address
Address block	USPS POSTNET barcode + payee mailing address (window envelope aligned)
Letter body	Your custom letter / detail copy, personalized per payee
Check stub - left	Your logo + return address (repeated on the check portion)
Check stub - center	Bank name and routing number
Check stub - right	Check number, check date, amount, and VOID notice
Pay to the Order Of	Payee full name
Written amount	Amount spelled out (e.g., *One Hundred and 00/100****DOLLARS)
Signature line	Your authorized signature image + 'Authorized By' label
MICR line	Machine-readable account, routing, and check numbers (auto-generated)