Billing support

Payment troubleshooting

If a payment didn't go through, it's usually a small detail on the card or billing form. Here are the errors we see most often, what causes them, and exactly how to fix each one.

Secure by design

Payments are processed on Square's hosted checkout. Card numbers are entered on Square's servers and never touch our website or our systems.

Cards we accept

Visa, Mastercard, American Express, Discover, plus Apple Pay, Google Pay and Cash App Pay where supported by your device.

How fast we respond

Billing enquiries are answered within one business day. Our hours are Monday – Friday, 9:00 AM – 6:00 PM (EST).

Common errors

What the message means and how to fix it

Decline decisions are made by your card issuer. We can see that a payment failed, but not why — so the steps below are the fastest route to a successful charge.

Card declined / GENERIC_DECLINE

Your bank rejected the charge. This is decided by the card issuer, not by us — we never see the reason code they used internally.

  • Confirm the card has sufficient available balance or credit.
  • Check that the card is enabled for online and international payments.
  • Call the number on the back of your card and ask them to approve the charge from “TrustForge Solutions”.
  • Try a different card, or ask us to send a bank-transfer invoice instead.

CVV_FAILURE / ADDRESS_VERIFICATION_FAILURE

The 3-digit security code or the billing address you entered does not match what your bank has on file.

  • Re-enter the CVV printed on the card (the 4-digit code on the front for American Express).
  • Use the billing address exactly as it appears on your card statement, including apartment or suite number.
  • Make sure the ZIP/postal code matches the billing address, not the delivery address.

INSUFFICIENT_FUNDS

The available balance on the card or account is lower than the invoice amount, or a daily spending limit was reached.

  • Check for pending holds that reduce your available balance.
  • Ask your bank to temporarily raise your daily transaction limit.
  • Split the payment: contact us and we can issue two smaller invoices.

CARD_EXPIRED / INVALID_EXPIRATION

The expiry date entered is in the past or does not match the card.

  • Use the MM/YY exactly as embossed or printed on the card.
  • If your card was recently reissued, use the new card number and expiry, not the old one.

Payment link expired or already used

Each checkout link is tied to a single invoice. Once the invoice is paid — or after the link's validity window — it can no longer be reopened.

  • Check your email for the paid receipt before trying again, so you don't pay twice.
  • Request a fresh link from us and complete payment in the same browser session.

“We couldn't start the payment session”

The checkout session could not be created. This is almost always caused by an incomplete billing form or an unusual phone/email format.

  • Enter the phone number in full international format, e.g. +1 704 530 5540.
  • Double-check the email address for typos and avoid trailing spaces.
  • Disable ad-blockers or privacy extensions that may block the checkout redirect, then retry.

Charged but the invoice still shows unpaid

Card networks can take a few minutes to confirm a payment. Some banks also place a temporary authorisation hold that looks like a charge.

  • Wait five minutes and refresh your invoice page — status updates automatically once the payment clears.
  • If it still shows unpaid after an hour, email us your invoice number and the last four digits of the card.

Duplicate charge on my statement

Retrying a checkout can create a second authorisation. Authorisations that were never captured drop off on their own.

  • Compare the two entries — pending authorisations usually disappear within 3–7 business days.
  • If both amounts have settled, contact us with both transaction dates and we will refund the duplicate.
Still stuck?

Talk to our billing team

Send us the details below and we can confirm whether a payment reached us, reissue a checkout link, arrange a bank transfer, or process a refund.

  • Your invoice number (format TFS-YYYY-000000)
  • The exact error message shown at checkout
  • Date, amount and last four digits of the card

Direct billing contacts

Refunds are handled under our refund policy and are returned to the original payment method. TrustForge Solutions, 2176 Webster Ave, Pittsburgh, PA 15219, United States.