> For the complete documentation index, see [llms.txt](https://docs.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.verifone.com/support-nordics/v400m/how-tos/how-to-process-a-sale.md).

# How to Process a Sale

Take a card payment on your V400M, and what to do if a payment is declined.

{% hint style="info" %}
**Use this when** you want to take a card payment from a customer.
{% endhint %}

## Take a payment

{% stepper %}
{% step %}

### Start the sale

Press the **green button** and enter the amount, then press the **green button** again to confirm.
{% endstep %}

{% step %}

### Your customer pays

Your customer can pay by:

* **Tapping** their card or phone (contactless).
* **Inserting** their card into the chip reader.
* **Swiping** their card through the magnetic stripe reader.
  {% endstep %}

{% step %}

### Check the result

The terminal shows whether the payment was **approved** or **declined**, and prints a receipt.

* **Approved:** the payment is complete.
* **Declined:** see [If a payment is declined](#if-a-payment-is-declined) below.
  {% endstep %}
  {% endstepper %}

## If a payment is declined

If a payment is declined, make a note of:

* The **error message** shown on the screen or receipt.
* The **transaction amount**.
* The **date and time** of the payment.
* The **last 4 digits** of the card used.
* The **serial number** of the terminal — see [How to Locate the Serial Number](/support-nordics/v400m/how-tos/how-to-locate-the-serial-number.md).

Then <mark style="color:red;">contact Verifone Support</mark> with these details.

{% hint style="info" %}
**Card not reading?**

* **Contactless not working:** restart the terminal and check it's online — see [How to Reboot the Terminal](/support-nordics/v400m/how-tos/how-to-reboot-the-terminal.md) and [How to Do a Network Test](/support-nordics/v400m/how-tos/how-to-do-a-network-test.md).
* **Chip reader not working:** clean the chip reader with one of the cleaning cards supplied, then restart the terminal.
  {% endhint %}

<details>

<summary>Keywords</summary>

Also called: process a sale, take a payment, card payment, make a sale, contactless, chip and PIN, swipe, declined payment. Search terms: sale, payment, purchase, tap, insert, swipe, contactless, approved, declined, receipt.

</details>


---

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