# User Variables
The user object in Integry is meant to represent your end-users. You can use this object if you need to pass custom user-specific data to a Flow.
#### Defining user variables
By default, the user object has:
* `userID` (Required)
* Used to associate a user's integrations with their account in your app.
* `apiKey` (Optional)
* Can be used to authenticate HTTP calls to your app.
If you need to add additional user variables:
1. Go to Workspace Settings -> Variables.
2. Add the variables under User Variables.
#### Accessing user variables in a flow
You can reference all user variables in flow steps.
1. In the body section of an HTTP Call step, click Add tag -> User Variables. 
2. Select the variable you want to use in the step. The values shown are only to help you map. 
Don't worry about the values shown; they're from your test account and will be replaced with your user's values at run-time.
#### Passing user variables with the SDK
When you [embed the marketplace widget](https://docs.integry.ai/hc/en-us/articles/23189976901529), you pass the variables in the user object.
```
user: {
userId: "asim@integry.io",
apiKey: "453546546754",
}
```
#### Passing additional user variables with the SDK
The additional variables are also passed in the same user object.
```
user: {
userId: "asim@integry.io",
apiKey: "453546546754",
orgId: "12",
region: "North America",
}
```
#### FAQs
**What happens if I pass an empty value for a user variable?**
In order to protect you from accidentally breaking existing integrations (that may be using that user variable's existing value), we don't empty out the value of a user variable when you send an empty string ("").
If you really want to empty it, send a blank space (" ").
---
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