# Certificate Serial Number

The serial number in the certificate depends on

- the [**DisposableHolder.identification code**](/products/leandisposable/enterprise-documentation/developer-documentation/api-references/data-objects#disposableholder)
- the [**DisposableHolder.identificationType**](/products/leandisposable/enterprise-documentation/developer-documentation/api-references/data-objects#disposableholder)
- the [**DisposableHolder.identificationCountry**](/products/leandisposable/enterprise-documentation/developer-documentation/api-references/data-objects#disposableholder)


The  identificationType defines the first 3 characters (prefix):

* **ITALIAN_TAX_CODE** → **"TIN"**
* **FOREIGN_TAX_CODE** → **"TIN"**
* **PASSPORT** → **"PAS"**
* **PERSONAL_NUMBER** → **"PNO"**
* **NATIONAL_IDENTITY_CARD** → **"IDC"**
* **DRIVING_LICENSE** → **"DL:"**
* **RESIDENCE_PERMIT** → **"RP:"**
* **RESIDENCE_PERMIT_TEMP** → **"RT:"**
* **EMBASSY_DOCUMENT** → **"DC:"**
* **AM** → **"AM:"**


**The serial number is defined as:**

**`<prefix><identificationCountry>-<IdentificationCode>`**

There are some exceptions:

* **AM** → `AM:<identificationCountry>-<PrefixAML><IdentificationCode>`.  Check how to use the [AML identification](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-ig-how-to-enroll-disposable-aml-identification)