> ## Documentation Index
> Fetch the complete documentation index at: https://docs.paypal.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Key concepts for NFC device tokenization

Use this page to look up terms and abbreviations used throughout the NFC device tokenization documentation.

| Term                                   | Definition                                                                                                                                                                                                                                      |
| -------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Device Partner                         | An organization that integrates with PP TSP to enable tap-to-pay functionality on their NFC-enabled hardware.                                                                                                                                   |
| Funding Primary Account Number (FPAN)  | The actual card number.                                                                                                                                                                                                                         |
| Green Path                             | The provisioning path the card network selects when a token can be approved without additional identity verification. The token moves directly to `ACTIVE`.                                                                                     |
| Identity Verification (IDV)            | An additional step required in the Yellow Path when the network requests user authentication before activating a token.                                                                                                                         |
| Key Encryption Key (KEK)               | Used to encrypt payment credential data returned to the client.                                                                                                                                                                                 |
| Lifecycle Management (LCM)             | Operations to activate, suspend, or close a token enrollment.                                                                                                                                                                                   |
| Near Field Communication (NFC)         | The wireless protocol enabling contactless tap-to-pay transactions.                                                                                                                                                                             |
| Network Token / TPAN                   | A secure substitute for the real card number (FPAN), unique per device and card.                                                                                                                                                                |
| Payment Credential                     | A dynamically generated, single-use cryptographic value required to authorize an NFC transaction.                                                                                                                                               |
| PayPal Token Service Provider (PP TSP) | PayPal's service that generates, delivers, and manages the full lifecycle of payment tokens across supported networks on behalf of device partners.                                                                                             |
| Provisioning                           | The process of generating a token and delivering it to a device for storage, triggered when a user adds a payment method.                                                                                                                       |
| Secure Credential Services (SCS)       | PayPal's product umbrella for in-store tap-to-pay credential functionality, of which PP TSP is a core component.                                                                                                                                |
| Token Lifecycle                        | The set of states a token can move through: `ACTIVE`, `CLOSED`, `PENDING_TOKEN_ACTIVATION`, `PENDING_VERIFICATION_REQUIRED`, and `SUSPENDED`.                                                                                                   |
| Token Requestor ID (TRID)              | A unique 11-digit identifier enabling the partner to request network tokens.                                                                                                                                                                    |
| Token Unique Reference (TUR)           | The network-assigned identifier for a provisioned token.                                                                                                                                                                                        |
| Wallet Server                          | The device partner's backend systems that integrate with PP TSP.                                                                                                                                                                                |
| Yellow Path                            | The provisioning path the card network selects when identity verification (IDV) is required before a token activates. The token is held in `PENDING_VERIFICATION_REQUIRED` until the cardholder completes verification, then moves to `ACTIVE`. |