# merchant-consumer-id

###### Internal customer identifier of the merchant system

↔ Request/Response parameter

## `<merchant-consumer-id>`

| Type | Condition | Restriction |
|  --- | --- | --- |
| xs:string | Optional | Length <=100 |


This parameter is needed for the regular customer concept. You can view more information about the regular customer concept [here](/docs/reporting/regular_customers/regular_customers_introduction).