> For the complete documentation index, see [llms.txt](https://docs.langstack.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.langstack.com/welcome/get-started/learn-langstack/introduction-to-flows-and-flow-components/exercise-2-store-list-of-customers.md).

# Exercise 2: Store list of customers

In this exercise, store a list of customers through a Flow.

## Requirements

* Create or select an existing entity for customers information 
* Create an API to receive a list of customers as a request 
* Trigger a Flow from the API to update the list of customers in the target entity.

## Solution

The solution entails three (3) steps: 

* Step 1: Create a Flow component to receive the customers' list from the API and create an entity record. 
* Step 2: Create a Flow to update the created entity record in the target entity “UserName\_Acc\_customers”. 
* Step 3: Create API to get a list of customers in the request and trigger the created Flow. 

{% hint style="info" %}
In this exercise, users are advised to replace “UserName” with their name. 
{% endhint %}