Where do I find my invoice number?

Your invoice number appears in the subject line and top-right corner of the PDF invoice we emailed you. If you cannot locate it, leave the field blank on Square and we'll match the payment to the right invoice on our end.

Is my card information stored on your servers?

No. Card processing happens entirely on Square's PCI DSS Level 1 certified infrastructure. Card numbers never reach Rudolph Technology systems and are never stored on our servers.

Can I pay multiple invoices at once?

Yes. Enter the total combined amount on the Square checkout page and reference the invoice numbers in the notes field. We'll apply the payment to each invoice and email you a consolidated receipt.

Will I get a receipt?

Yes. Square sends an itemized PDF receipt to the email address you provide within seconds of a successful payment. The receipt includes the date, amount, and last four digits of the card used.

What if my card is declined?

Square will display an immediate error message and no charge will be made. Common causes are incorrect ZIP code, expired card, or insufficient funds. Try another card or contact your bank. If you continue having trouble, call our account team and we'll take the payment by phone.

Do you accept international cards?

Yes, Square processes Visa, Mastercard, American Express, and Discover cards issued worldwide. Some international card-issuers may block large international transactions - if this happens, your bank can usually authorize it after you call them.

Secure Online Payment

Pay Your Invoice in Seconds.

Click through to our secure Square checkout to enter your payment amount. PCI-compliant processing, instant email receipt, no account required.

Pay Now

256-bit SSL Encryption
PCI DSS Level 1
Instant Email Receipt

Ready to Make a Payment?

Click below to open our secure Square checkout in a new tab. Enter your invoice amount, fill in your card details on Square's PCI-compliant page, and you'll receive an emailed receipt within seconds.

Make a Secure Payment

VISA
MC
AMEX
DISC

Need financing? PayPal Credit may be available for qualifying purchases. Subject to credit approval.

Processed securely by Square Payments

Your Payment Is Secure

Payments are processed entirely on Square's PCI DSS Level 1 certified servers. Card details are entered on Square's secure checkout page and never touch Rudolph Technology systems.

Bank-Level Encryption TLS 1.3 in transit, AES-256 at rest at Square
All Major Cards Accepted Visa, Mastercard, American Express, Discover
Instant Receipt Itemized PDF receipt emailed within seconds
No Account Required Pay as a guest - no registration, no passwords

Need help? Call 734-619-7731

ACH Bank Transfer

Lower processing fees on invoices over $2,500. We'll send routing details and an authorization form.

Request ACH details

Check by Mail

Mail checks to our Ann Arbor headquarters. Include your invoice number in the memo line. Allow 5-7 business days.

Get mailing address

Pay Over the Phone

Call our account team during business hours. We can take card payment by phone if you prefer not to use the online checkout.

Call 734-619-7731

Where do I find my invoice number?: Your invoice number appears in the subject line and top-right corner of the PDF invoice we emailed you. If you cannot locate it, leave the field blank on Square and we'll match the payment to the right invoice on our end.
Is my card information stored on your servers?: No. Card processing happens entirely on Square's PCI DSS Level 1 certified infrastructure. Card numbers never reach Rudolph Technology systems and are never stored on our servers.
Can I pay multiple invoices at once?: Yes. Enter the total combined amount on the Square checkout page and reference the invoice numbers in the notes field. We'll apply the payment to each invoice and email you a consolidated receipt.
Will I get a receipt?: Yes. Square sends an itemized PDF receipt to the email address you provide within seconds of a successful payment. The receipt includes the date, amount, and last four digits of the card used.
What if my card is declined?: Square will display an immediate error message and no charge will be made. Common causes are incorrect ZIP code, expired card, or insufficient funds. Try another card or contact your bank. If you continue having trouble, call our account team and we'll take the payment by phone.
Do you accept international cards?: Yes, Square processes Visa, Mastercard, American Express, and Discover cards issued worldwide. Some international card-issuers may block large international transactions - if this happens, your bank can usually authorize it after you call them.

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