> ## Documentation Index
> Fetch the complete documentation index at: https://help.maestra.io/llms.txt
> Use this file to discover all available pages before exploring further.
# How to add a Promo Code into a Campaign
You will be likely to send promo codes to your customers.
# There are two ways to do that:
1. Add a promo code into a message as a custom dynamic parameter.
Create a file with identifiers of the customers that contains a promo code for each customer. Follow the guidelines to create a file and send a message using it. This way is convenient if you need to send promo codes only once.
2. Create a pool of promo codes, issue them to customers, and add them into messages. It is useful if you need to regularly issue promo codes manually or automatically.
## Let’s have a closer look at the second way:
1. Follow the [guidelines](/loyalty/how-to-import-promo-codes-into-a-project) to create a pool of promo codes.
The pool must be marked as "Can be used" in the UI.
2. Issue promo codes to your customers:
* manually (follow the guidelines)
* in a flow/ API method
3. Add a dynamic content message template parameter to the text of your message to send the last received promo code from a pool to each customer.
Template:
```
`${Recipient.LastReceivedPromoCode.WithTypePool.Value}`
```
where "Pool" is a system name of your pool of promo codes.
For example, a message template parameter for the following pool:
will be: **\$\{Recipient.LastReceivedPromoCode.WithTypeBirthdaypromocodes.Value}**