Paying your bill online with Mercury Webpay is fast, easy, and secure! Please enter your Customer ID and Policy Number as shown on your most recent statement. Customer ID: Policy Number:   You will find your Policy Number and Customer ID on your billing statement as shown in the sample below: Do you have a question about your billing statement? Are you unable to find your Customer ID or Policy Number? Would you like to make a payment by telephone? We want to help you! Just call us at one of the following numbers... 1-909-919-7320 (California) 1-909-919-7335 (California Commercial Auto) 1-800-503-3724 (All other states) We value your online experience. If you are having a technical difficulty, please contact our Helpdesk at 1-888-637-2175.