# Glossary Terms

## Delivery Rate 

The percentage of people receive your message. 

## Unoffical WhatsApp API

We develop our own WhatsApp API unofficially to allow customers to blast their promotional messages. Here is the limitation of this unofficial blasting.

{% content-ref url="../limitation/unofficial-whatsapp-blasting" %}
[unofficial-whatsapp-blasting](https://docs.yaeris.com/limitation/unofficial-whatsapp-blasting)
{% endcontent-ref %}

## Up to 90% delivery rate

0% - 90% people actually receive your WhatsApp messages.

## 100% delivery rate

There are 2 types of 100% delivery rate package:

* Using unofficial WhatsApp API
  * The difference between Up to 90% delivery rate package and 100% delivery rate package is we allow customer to blast additional 2 more times without editing existing campaign for 100% delivery rate.

| Description                     | Up to 90% delivery rate package | 100% delivery rate package |
| ------------------------------- | ------------------------------- | -------------------------- |
| Using unofficial WhatsApp API   | Yes                             | Yes                        |
| Using official WhatsApp API     | No                              | No                         |
| Number of blasting per campaign | 1 time                          | 3 times                    |

* Using official WhatsApp API
  * This package also known as WA Biz Blasting. 
  * We need to apply with Meta if you want to use this service. Please check this page for more information.

{% content-ref url="../services/whatsapp-blasting-service/official-wa-biz-blasting" %}
[official-wa-biz-blasting](https://docs.yaeris.com/services/whatsapp-blasting-service/official-wa-biz-blasting)
{% endcontent-ref %}