# ConvertPlus trials flow

In order to generate a ConvertPlus trial link, it’s mandatory to have the following parameters in the buy link URL.

## Mandatory parameters for all types of buy links (trials included)

* **Merchant ID** (merchant=ID)
* **Template** (tpl=default)
* **Catalogue Product** ID (prod=ID)

## Mandatory parameters for the trials flow

* **Signature**: for building a Trial buy link it is required to generate a signature - [ConvertPlus Buy-Link Signature for Catalog Products](/shopping-carts/convertplus/convertplus-buy-link-signature-for-catalog-products.md)
* **Price** (define trial price for the corresponding currency - 0 for free trial, higher than 0 for paid trial); **example**: tprices=USD%3A10%2CEUR%3A0
* **Period** (define period – not less than 7 days); **example**: tperiod=7
* **Currency** (define currency); **example**: currency=USD
* **Quantity** (define quantity – 1 is the only value supported); **example**: qty=1

How your URL should look like:

```
https://store.checkout.com/checkout/buy?merchant=merchant&tpl=default&prod=productiD&qty=1¤cy=USD&tprices=USD%3A10%2CEUR%3A0&tperiod=7&signature=e9xe3a3cf015a3ff4ad687b02ba55207de20abb1d24194dcfc53a140d882fc4b
```

For more details on parameters setup, check [ConvertPlus URL parameters](/shopping-carts/convertplus/convertplus-url-parameters.md).

{% hint style="warning" %}
**Limitations**:

* The trial period/price applies to a single product.
* The trial period can be a minimum of 7 days.
* 2Checkout uses the custom prices and ignores the per-product pricing configuration.
* Supported payment methods: credit and debit cards, PayPal, and Direct Debit.
* 2Checkout automatically converts the trial to a paid subscription when the trial interval expires by charging shoppers based on the payment-on-file information. Customers can opt-out at any time using their myAccount.
  {% endhint %}


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