Sullivan Mahoney LLP Client Committed. Community Minded.
905.688.6655 SSL Secured · Moneris
Client Services

Make a Payment

Settle an invoice or remit a retainer through our encrypted Moneris checkout. All transactions are processed in Canadian dollars and confirmed by email within minutes.

Your file number appears on every letter, email, or statement from our office — typically formatted FILE-2026-####.

CAD

You will be redirected to Moneris to complete your payment securely.

Help & Information

Frequently Asked Questions

What payment methods are accepted?
We accept Visa and Mastercard credit and debit cards through our secure Moneris checkout. We do not accept American Express, cash, or wire transfers through this portal. For other payment arrangements, please contact our accounts team.
Is it safe to pay online?
Yes. Every transaction is encrypted with 256-bit SSL and processed by Moneris, a PCI-DSS Level 1 provider. Your card details are entered on Moneris’ servers and never touch ours.
Where do I find my invoice number?
Your file or invoice number appears on every letter, email, or statement from our office. It is formatted FILE-2026-#### and is usually printed in the top-right corner of the document.
Will I receive a receipt?
Moneris will display a confirmation on screen and email you a transaction receipt. For an itemised receipt on firm letterhead, please contact our accounts team and we will issue one within one business day.
What if my invoice number is not found?
Please double-check the number against your correspondence. If it still cannot be found, use the Pay by Amount tab and include your file number in the note field, or call our office directly during business hours.
Having trouble paying?
Our accounts team is available Monday to Friday, 9am to 5pm. Please call our St. Catharines office at 905.688.6655 or our Niagara Falls office at 905.357.3334 and we will be happy to walk you through the payment.