# Purchaser DOB

Source: https://developer.avalara.com/avatax-for-bevalc/requirements/purchaser-dob/

# Purchaser DOB

**Element type: Required**

**Endpoints used:** [TransactionParameterModel](https://developer.avalara.com/api-reference/avatax/rest/v2/models/TransactionParameterModel/), [TransactionLineParameterModel](https://developer.avalara.com/api-reference/avatax/rest/v2/models/TransactionLineParameterModel/)

Your integration must provide a way for users to specify the purchaser's date of birth. This is done using the`PurchaserDOB` parameter. This parameter is used to evaluate age restrictions for the purchaser. The purchaser must be of legal age to request the shipment. This parameter is optional for users to input, but if it is provided, then AvaTax will perform a check on this value for compliance.

This value should be ISO-8601 compliant (e.g. 2020-07-21).

```
"lines": [  {    "parameters":[      {        "name":"PurchaserDOB",        "value":"1995-03-29"      }    ]  }]
```

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