KAST Business lets eligible Business Admins receive customer payments using stablecoin invoices and payment links.

Your customers don’t need a KAST account or a wallet connection to pay. They can open the payment link and manually send a supported USD-denominated stablecoin to the deposit address shown during checkout.

Important: Invoices and payment links currently support eligible stablecoin payments only. ACH, wire transfers, bank-transfer deposits, card payments, recurring payments, and unsupported crypto assets such as ETH or SOL aren’t supported through this payment flow.

Who Can Create Invoices and Payment Links?

Only Business Admins can create and manage invoices and payment links. Admins can also access the revenue dashboard and customer directory.

Employees don’t currently have access to these features.

How Can I Receive Payments?

KAST Business gives you two options:

• Invoices — Create an itemized payment request with customer details, line items, optional notes or terms, an optional due date, and an automatically generated PDF.
• Payment Links — Create a simpler payment request with a display name, amount, optional due date, and note.

Both options use KAST’s Hosted Checkout. Eligible payments are settled into your Dedicated Business Treasury Balance.

How Do I Create an Invoice?

1. Open the KAST Business Invoicing Dashboard.
2. Select New Invoice.
3. Choose an existing customer or add a new one.
4. Add the invoice details, including the description, quantity, unit price, and optional tax settings.
5. Add any notes, payment terms, or a due date if needed.
6. Generate a payment link when you’re ready for your customer to pay.

Your invoice remains a Draft until you generate a payment link.

Once the payment link is generated, the invoice moves to Pending, and the amount and line-item details can no longer be edited. The due date can still be updated while the invoice is Pending or Partially Paid.

How Does My Customer Pay?

Your customer can:

1. Open the payment link.
2. Review the invoice or payment request.
3. Select a supported stablecoin and network.
4. Copy the unique deposit address provided by KAST.
5. Send the payment to that address.
6. Select Check Payment Status to refresh the payment status.

Your customer doesn’t need a KAST account or wallet connection to complete the payment.

When Will I Receive the Payment?

Once an eligible stablecoin payment receives the required on-chain confirmation, it’s credited to your Dedicated Business Treasury Balance.

KAST applies a 1:1 USD stablecoin rate with 0% spread for this payment flow. There’s no batching delay.

If your customer makes multiple payments across supported networks for the same invoice, KAST can combine those payments and reconcile them against the invoice total.

What Do the Invoice Statuses Mean?

Your invoice may show one of the following statuses:

• Draft — The invoice has been created, but a payment link hasn’t been generated yet.
• Pending — The invoice is ready for payment.
• Partially Paid — Part of the requested amount has been received.
• Paid — KAST detected and reconciled an eligible stablecoin payment.
• Expired — The payment window has ended.
• Revoked — The invoice was canceled by an Admin.
• Collected — An Admin marked the invoice as settled outside the KAST stablecoin checkout flow, such as by wire, cash, or another platform.

A Partially Paid invoice can’t be revoked because funds have already been received.

How Long Does My Customer Have to Pay?

The payment window depends on whether you set a due date:

• If you set a due date, eligible payments are automatically reconciled until the due date plus a 7-day grace period.
• If you don’t set a due date, the payment window is 120 days from the invoice creation date.
• The payment window doesn’t restart after a partial payment.

Payments sent after the active payment window may still be credited and logged, but the invoice may not update automatically. If this happens, contact KAST Concierge for help reviewing the payment.

Are There Any Fees or Limits?

At launch:

• Stablecoin invoice and payment-link processing fees are 0%.
• KAST applies a 1:1 USD stablecoin rate with 0% spread.
• There’s no fee to create an invoice.
• KAST doesn’t charge a network gas fee pass-through for this flow.
• The minimum invoice amount is $1 USD.
• You can create up to 50 invoices and/or payment links per day.

A standard processing fee may be introduced in the future.

What If My Customer Sends the Wrong Asset or Uses an Unsupported Network?

If your customer sends an unsupported asset, such as ETH or SOL, or uses an unsupported network, the payment won’t be automatically matched to the invoice and the invoice status won’t change.

Recovery isn’t guaranteed. If this happens, ask your customer to contact your business, and you can then contact KAST Concierge for further assistance.

What If My Customer Overpays?

Overpayments aren’t automatically refunded.

The additional amount remains in your Business Treasury Balance, and your business can decide how to handle the overpayment outside the system.

What If My Customer Underpays?

If your customer pays only part of the requested amount, the invoice may remain Partially Paid until the remaining amount is received or the invoice expires.

Small underpayments may be handled automatically when the cumulative amount received reaches the required backend threshold.

Frequently Asked Questions

Can I Create an Invoice Without a Payment Link?

Yes. You can create an invoice without generating a payment link. This can be useful for record-keeping or manually tracking a payment.

How Do I Create an Invoice?

Open the Invoicing Dashboard and select New Invoice. Choose an existing customer or add a new one, enter your invoice details and line items, then generate a payment link if needed.

Your invoice remains a Draft until you generate the payment link.

Can I Edit an Invoice After Generating a Payment Link?

You can’t edit the invoice amount or line items after a payment link has been generated.

If no payment has been received, you can revoke the invoice and duplicate it to create a new draft.

You can still update the due date while the invoice is Pending or Partially Paid.

How Does My Customer Pay?

Your customer opens the payment link, selects a supported stablecoin and network, and sends the payment to the displayed deposit address.

They don’t need a KAST account or wallet connection to pay.

Can I Undo a Revoked Invoice?

No. Revoking an invoice is permanent.

If needed, you can duplicate the revoked invoice to create a new one with the same details.

Will My Customer Receive an Invoice Email?

Yes, if you’ve provided the customer’s email address and generated a payment link.

KAST sends an automated notification with the amount due, an invoice summary, and a Review and Pay Invoice button.

Can I Export Payment Records?

Yes. Business Admins can export settled payment records for reconciliation and reporting, including the blockchain transaction hash and network name.

What Happens if a Payment Arrives After the Payment Window?

The payment may still be credited and logged, but the invoice may not update automatically.

If this happens, contact KAST Concierge for help reviewing the payment.

Are There Any Fees for Creating or Collecting an Invoice?

Stablecoin checkout processing fees are currently 0% at launch, and there’s no fee to create an invoice.

A standard processing fee may be introduced in the future.

Is There a Limit on How Many Invoices I Can Create?

Yes. You can create up to 50 invoices and/or payment links per day.

There’s currently no limit on the total number of active invoices.

What Is the Minimum Invoice Amount?

The minimum invoice amount is $1 USD.

There’s no maximum invoice amount, but applicable treasury and compliance limits still apply.

What Happens if My Customer Pays From a Different Network Than Initially Selected?

As long as your customer sends a supported USD stablecoin using a supported network, KAST can reconcile the payment.

Payments made across multiple supported networks can also be reconciled against the same invoice.

My Customer Paid, but the Invoice Still Shows Pending. What Should I Do?

Ask your customer to select Check Payment Status on the checkout page.

Confirm that they sent a supported USD stablecoin using a supported network. If everything is correct, the payment may still be waiting for on-chain confirmation.

Can I Revoke an Invoice That Has Already Been Partially Paid?

No. Once an invoice is Partially Paid, it can’t be revoked because funds have already been received.

You can wait for the customer to complete the remaining payment or for the invoice to expire.

My Payment Link Expired. What Should I Do?

Once the payment link expires, the invoice moves to Expired.

Duplicate the expired invoice to create a new invoice and payment link.