# Connecting PayTomorrow

> Connecting to PayTomorrow uses API credentials supplied by PayTomorrow support. You will receive a set of values from PayTomorrow: the first three are the authe

Connecting to PayTomorrow uses API credentials supplied by PayTomorrow support.
You will receive a set of values from PayTomorrow: the first three are the
authentication credentials, and the remaining four configure the optional price
estimator shown at checkout. Confirm the right values for your business with
PayTomorrow before you begin.

The authentication fields are:

- **Username**
- **Password**
- **API Signature**

The price estimator fields are:

- **Public ID**
- **Max Term**
- **Prime APR**
- **Store Display Name**

Enter these in the PayTomorrow gateway settings and save. The integration validates the
credentials against PayTomorrow when you save the gateway.

![PayTomorrow gateway settings](/_astro/cdn/977b4f2204/connect-1.png)

![PayTomorrow gateway settings continued](/_astro/cdn/9a9dac546d/connect-2.png)

:::note[Tip]
A **Sandbox** option is available in the shared settings. Enable it to point the
connection at PayTomorrow's staging environment while you test.
:::

Once connected, see the [Using PayTomorrow](/payment-providers/paytomorrow-using/) guide
for how PayTomorrow appears at checkout and how payments, authorisations, and
captures settle.