In 加密支付系统s, an invoice is a key tool for requesting precise payments from customers. These invoices typically include a specific amount, the cryptocurrency type, an expiration time, and detailed order information. However, issues such as Underpaid and Expired Invoices often occur in real-world payment flows, where some customers fail to complete invoices on time or in full.
In this article, we’ll explore why these situations occur, why it’s important to resolve them, and how OxaPay offers smart tools to manage them effectively.
Understanding Crypto Invoices
A 加密发票 is not just a request for money—it’s a structured, time-sensitive request for a fixed amount of a specific cryptocurrency. It enables businesses to track payments, automate service delivery, and prevent pricing errors. Unlike traditional payment methods, crypto invoices often include a countdown timer and wallet address generated per transaction.
Depending on the customer’s behavior, each invoice may end in one of three possible states:
- Fully Paid: The customer sends the expected amount, and the system confirms it.
- Expired: The customer does not send the payment before the deadline.
- Underpaid: The customer sends less than the requested amount.
Therefore, let’s take a closer look at why expired or underpaid invoices occur and how merchants can deal with them effectively.

Why Do Invoices Become Expired or Underpaid?
1. What Is an Expired Invoice?
In simple terms, an expired invoice occurs when the customer fails to complete the payment within the allotted time. In 加密支付, invoices typically have a countdown timer to ensure price accuracy and time-sensitive settlement. Once the timer runs out, the invoice automatically becomes inactive and cannot accept further payments—unless manually reviewed and resolved by the merchant.
2. What Is an Underpaid Invoice?
An underpaid invoice occurs when the customer sends less than the requested amount. For example, this situation can happen due to rounding errors, incorrect input, exchange rate changes, or network and wallet fees deducted before delivery. In such cases, merchants must manually handle underpaid invoices—either by accepting, refunding, or extending them—based on business policy and the remaining amount.
Why Resolving These Invoices Is Critical
Leaving expired or underpaid invoices unresolved can lead to several issues:
- Confusion for customers and increased support requests
- Inconsistent records in order management and accounting
- Stuck funds without clear settlement
- Reduced trust and satisfaction from clients
That’s why resolving these statuses quickly, transparently, and intelligently is part of professional payment handling.

How OxaPay Enables Smart Management of These Invoices
When customers leave invoices unpaid or fulfill them only partially, businesses therefore need reliable tools to respond without delay. OxaPay provides a flexible and intuitive management system directly within the dashboard, allowing merchants to resolve such invoice states in just a few clicks. The approach varies depending on whether the invoice is underpaid or expired.
When an Invoice Is Underpaid
If a customer sends less than the requested amount, the system automatically marks the invoice as “Underpaid.” This state requires merchant action to move forward. OxaPay offers three resolution options:
1. Accept the Partial Payment
Merchants can choose to accept the received amount—even if it doesn’t match 100% of the invoice value. Businesses often use this option when the payment is almost complete (around 97–99%) and they choose to finish the transaction instead of rejecting it.
2. Refund the Payment
If the gap is too big or the product cannot be provided for the lower amount, the merchant simply returns the funds to the customer. This helps preserve customer trust and avoid complications.
3. Extend the Time
Sometimes, the customer simply ran out of time or missed part of the instructions. Instead of issuing a new invoice, merchants can extend the current one by an additional hour, giving the payer a second chance to send the remaining amount.
笔记: These same three options are available for underpaid Payment Links as well, ensuring unified control across all payment methods.
After fixing underpaid amounts, merchants should set clear rules for expired invoices to keep handling consistent, avoid disputes, and maintain accurate records.
When an Invoice Has Expired
Once the payment window closes without any successful payment, the invoice status changes to “Expired.” This can happen due to delayed decision-making by the customer, technical issues, or lack of follow-through.
OxaPay provides two actions to manage expired invoices:
1. Accept the Payment Manually
In cases where the customer sent funds just after the expiration, and the amount is correct, the merchant may still choose to accept the payment and mark the invoice as complete. This way, merchants don’t lose revenue because of small timing delays.
2. Issue a Refund
If the invoice is no longer valid—because of price changes or a canceled order—the merchant refunds the funds, protecting both the business and the customer from disputes.
Note: Merchants can also Accept or Refund expired Payment Links, which keeps crypto payment handling fully consistent.
For a complete overview of how to manage different invoice outcomes, watch the videos “How to Finalize Underpaid Invoice Payments” and “How to Finalize Expired Invoice Payments” on OxaPay’s YouTube channel.
Key Tips for Managing Expired and Underpaid Invoices
To ensure smooth operations and avoid unnecessary support friction:
- Set realistic expiration times based on typical customer behavior.
- Use auto-notifications to remind customers of pending invoices before they expire.
- Monitor partial payments in real-time and prepare responses accordingly.
- Clearly define refund policies for late or underpaid invoices in your terms of service.
Step-by-Step Workflow in the OxaPay Dashboard
- 前往 商户服务 节。
- Open the Merchant Payments tab.
- Use filters to locate invoices with the status “Underpaid” or “Expired”.
- 点击 Actions next to the invoice.
- 选择 接受, Refund或 Extend Time as appropriate.
结论
In the real world, crypto payments don’t always go perfectly. Delays and shortfalls happen. What sets a professional payment system apart is how it handles those exceptions.
与 OxaPay 加密网关, businesses gain smart, accessible tools to resolve underpaid and expired invoices smoothly. These features help maintain customer trust, reduce financial ambiguity, and streamline backend operations—all with just a few clicks.