---
title: "Payment methods and invoices"
description: "Manage your credit cards and download invoice PDFs from the Interlinked AI Billing tab — add or change payment methods, understand the minimum-card rule, and review your complete invoice history."
section: "Billing and usage"
url: https://interlinked-ai.com/en/resources/docs/payment-methods-and-invoices
lang: en
lastUpdated: 2026-04-21
---

# Payment methods and invoices

## Overview

The Billing tab in Settings includes two important areas for managing the financial operations of your Interlinked AI account: **Payment methods** and **Invoice history**. Together, these sections let you control how you pay for your subscription and review every charge that has been made.

This article covers how to add and manage credit cards, the minimum payment method rule for subscribers, how to navigate your invoice history, and how to download invoice documents.

## Payment methods

The Payment methods section of the Billing tab is where you manage the credit cards associated with your Interlinked AI account.

### What you can do

From this section, you can:

- **Add a new card** — Add a credit or debit card to your account by entering the card details through the secure Stripe-powered form
- **Change the default card** — If you have multiple cards on file, select which one should be used for subscription renewals, overage charges, and other billing events
- **View existing cards** — See the last four digits and expiration date of each card on file

### Adding a new card

To add a new payment method:

1. Navigate to **Settings** → **Billing** at `https://panel.interlinked-ai.com/en/settings?tab=billing`
2. Scroll to the **Payment methods** section
3. Click **Add a new card**
4. Enter your card details in the secure form
5. Confirm the addition

The new card is stored securely through Stripe. Interlinked AI does not store your full credit card number — it is transmitted directly to and managed by Stripe's PCI-compliant infrastructure.

<div class="docs-media-placeholder">
  <p class="mono-label">Screenshot: Payment methods section showing existing cards and the "Add a new card" action</p>
</div>

### Changing the default card

If you have multiple payment methods on file, the default card is the one that will be charged for:

- Subscription renewals
- Overage charges
- Any other billing events

To change your default card, select the card you want to use as the primary payment method from the Payment methods section.

<div class="docs-callout docs-callout-tip">
  <p><strong>Tip</strong></p>
  <p>If your current card is about to expire, add a new card and set it as the default before the expiration date. This prevents payment failures on your next renewal. See <a href="/en/resources/docs/billing-and-subscription-management">Billing and subscription management</a> for details on payment failure handling.</p>
</div>

### Minimum payment method rule

One of the most important rules to understand about payment methods:

**If you have an active paid subscription, there must always be at least one valid payment method on file.**

This means:

- You cannot remove your only card while you have an active Starter, Pro, or Ultra subscription
- If you want to remove a card, you must first add a different card as a replacement
- This rule ensures that subscription renewals and overage charges can always be processed

<div class="docs-callout docs-callout-warning">
  <p><strong>Important</strong></p>
  <p>A subscribed account cannot have zero payment methods. If you need to change your card, add the new card first so that a valid payment method always remains on file. Then you can remove the old card if desired.</p>
</div>

### Free plan accounts

If your account is on the Free plan (no active paid subscription), the minimum payment method rule does not apply. You can add or remove cards freely since no charges are being processed.

## Invoice history

The Invoice history section provides a table of every billing event associated with your account. This includes subscription charges, overage billing, and any other financial transactions.

### What the table shows

Each row in the invoice history table displays:

| Column | Description |
|--------|-------------|
| **Invoice** | An identifier or reference for the billing event |
| **Date** | The date the invoice was generated |
| **Amount** | The total amount charged, in your billing currency (USD or MXN) |
| **Status** | The current status of the invoice |

### Invoice statuses

You may see the following statuses on your invoices:

| Status | Meaning |
|--------|---------|
| **Paid** | The charge was processed successfully and the payment has been received |
| **Pending** | The invoice has been generated but the payment has not been fully processed yet |
| **Canceled** | The invoice or associated charge was canceled — no payment was collected |

<div class="docs-media-placeholder">
  <p class="mono-label">Screenshot: Invoice history table showing invoices with dates, amounts, and status indicators</p>
</div>

### Downloading invoice PDFs

You can download individual invoices as PDF documents from the Invoice history table. Each invoice PDF includes:

- Detailed line items (subscription charges, overage charges, applied discounts)
- The billing period covered
- The total amount charged
- Payment method used

These PDFs are useful for accounting, expense reporting, and tax documentation.

<div class="docs-callout docs-callout-tip">
  <p><strong>Tip</strong></p>
  <p>Download your invoices monthly for your business records. The Invoice history table keeps a complete history, but having PDF copies in your accounting system ensures you always have documentation readily available.</p>
</div>

### What appears on invoices

Your invoices can include several types of charges:

- **Subscription charges** — The recurring cost of your plan (monthly, 6-month, or 12-month)
- **Overage charges** — Extra message costs beyond your included allowance. These appear as separate line items. See [Overage usage and extra messages](/en/resources/docs/overage-usage-and-extra-messages)
- **Proration credits or charges** — When you upgrade mid-term, the prorated amount appears on the invoice. See [Upgrade, downgrade, and plan changes](/en/resources/docs/upgrade-downgrade-and-plan-changes)
- **Promotional discounts** — If a promotional or partner code was applied, the discount is reflected on the relevant invoice

## Currency on invoices

All invoice amounts are displayed in your billing currency:

- **MXN** for accounts located in Mexico
- **USD** for accounts located in any other country

This matches the currency shown everywhere else in the platform. See [Plans and pricing — currency rules](/en/resources/docs/plans-and-pricing) for more details on how billing currency is determined.

## Billing security

All payment processing in Interlinked AI is handled through **Stripe**, one of the most widely trusted payment infrastructure providers in the world.

Key security points:

- **Full credit card numbers are not stored by Interlinked AI** — Card details are transmitted directly to Stripe's servers
- **PCI-DSS compliant** — Stripe maintains the highest level of payment security certification
- **Encrypted transmission** — All card data is transmitted over encrypted connections
- **Secure portal** — Subscription management actions like cancellation are handled through Stripe's own secure portal

You can manage your payment methods with confidence that your financial data is protected by industry-leading security infrastructure.

## What to do next

- **Review your billing details** — Check your current plan, renewal date, and subscription status. See [Billing and subscription management](/en/resources/docs/billing-and-subscription-management).
- **Understand overage charges** — Learn how extra messages are priced and billed. See [Overage usage and extra messages](/en/resources/docs/overage-usage-and-extra-messages).
- **Change your plan** — Upgrade or downgrade your subscription. See [Upgrade, downgrade, and plan changes](/en/resources/docs/upgrade-downgrade-and-plan-changes).