Token Types

Basis Theory offers several pre-configured token types for various use-cases and compliance requirements. Token Types define the rules around a data type such as validation requirements, default token containers, fingerprint expressions, and mask expressions.

When creating a token without a fingerprint_expression, the fingerprint_tokens tenant setting must be set to true to automatically apply the Default Fingerprint Expression associated with the token type. See our docs on Fingerprints for details.

Token

The token type is used for general data types that don't require input validation or formatting restrictions.

Token Attribute	Value
Type	token
Default Containers	[ "/general/high/" ]
Input Validation	None
Input Length	Any
Default Fingerprint Expression	{{ data | stringify}}
Default Mask Expression	null

Card

Token Attribute	Value
Type	card
Default Containers	[ "/pci/high/" ]
Input Validation	See Card Object for validation requirements
Default Fingerprint Expression	{{ data.number }}
Default Mask Expression	{   "number": "{{ data.number | reveal_last: 4 }}",   "expiration_month": "{{ data.expiration_month }}",   "expiration_year": "{{ data.expiration_year }}" }

Bank

Token Attribute	Value
Type	bank
Default Containers	[ "/bank/high/" ]
Input Validation	See Bank Object for validation requirements
Default Fingerprint Expression	{{ data.account_number }}|{{ data.routing_number }}
Default Mask Expression	{   "routing_number": "{{ data.routing_number }}",   "account_number": "{{ data.account_number | reveal_last: 4 }}" }

Card Number

Token Attribute	Value
Type	card_number
Default Containers	[ "/pci/high/" ]
Input Validation	Luhn-valid, numeric
Input Length	13 - 19
Default Fingerprint Expression	{{ data }}
Default Mask Expression	{{ data | reveal_last: 4 }}

Examples:

Input Data	Masked Value
4242424242424242	XXXXXXXXXXXX4242
36227206271667	XXXXXXXXXX1667

US Bank Account Number

Token Attribute	Value
Type	us_bank_account_number
Default Containers	[ "/bank/high/" ]
Input Validation	Numeric
Input Length	3 - 17
Default Fingerprint Expression	{{ data }}
Default Mask Expression	{{ data | reveal_last: 4 }}

Examples:

Input Data	Masked Value
1234567890	XXXXXX7890

US Bank Routing Number

Token Attribute	Value
Type	us_bank_routing_number
Default Containers	[ "/bank/low/" ]
Input Validation	Numeric, ABA-valid
Input Length	9
Default Fingerprint Expression	{{ data }}
Default Mask Expression	{{ data | reveal_last: 4 }}

Social Security Number

Token Attribute	Value
Type	social_security_number
Default Containers	[ "/pii/high/" ]
Input Validation	Numeric with optional delimiter of "-"
Input Length	9 (not including delimiting characters)
Default Fingerprint Expression	{{ data | remove: '-' }}
Default Mask Expression	{{ data | reveal_last: 4 }}

Examples:

Input Data	Masked Value
123456789	XXXXX6789
123-45-6789	XXX-XX-6789

Employer ID Number

Token Attribute	Value
Type	employer_id_number
Default Containers	[ "/pii/high/" ]
Input Validation	Numeric with optional delimiter of "-"
Input Length	9 (not including delimiting characters)
Default Fingerprint Expression	{{ data | remove: '-' }}
Default Mask Expression	{{ data | reveal_last: 4 }}

Examples:

Input Data	Masked Value
123456789	XXXXX6789
12-3456789	XX-XXX6789