Transaction authentication

1. A method, comprising:

receiving a selected biometric type from a user;

capturing biometric measurements from the user that correspond to the selected biometric type;

generating a biometric token from the biometric measurements based on the biometric type;

associating the biometric token with a pre-staged transaction defined by the user and a user identifier for the user;

providing the biometric token and a pre-staged transaction identifier for the pre-staged transaction to the user;

identifying the user at the transaction terminal;

authenticating the user to a user identifier and an account;

searching a list of pre-staged transactions for a match on the user identifier;

obtaining the biometric token, the selected biometric type, and the pre-staged transaction identifier from the match;

providing the biometric token, the selected biometric type, and pre-staged transaction details associated with the pre-staged transaction identifier to the transaction terminal;

instructing the transaction terminal to capture candidate biometric features of the user at the transaction terminal based on the selected biometric type, calculate a candidate biometric token from the candidate biometric features based on the selected biometric type, authenticate the user for performing the pre-staged transaction when the candidate biometric token matches the biometric token, and perform the pre-staged transaction when the user is authenticated using the pre-staged transaction details; and

removing the biometric token from the list of pre-staged transactions upon confirmation that the transaction terminal processed the pre-staged transaction on behalf of the user at the transaction terminal.

2. The method of claim 1 , wherein receiving further includes authenticating the user to an account before receiving the selected biometric type from the user.

3. The method of claim 2 , wherein capturing further includes activating one or more biometric-enabled devices of a user-operated device based on the selected biometric type.

4. The method of claim 3 , wherein generating further includes obtaining the biometric measurements from one or more biometric-enabled devices of the user-operated device that is a transaction terminal.

5. The method of claim 3 , wherein generating further includes obtaining the biometric measurements from the one or more biometric-enabled devices of the user-operated device that is a mobile phone, a wearable processing device, a desktop computer, a laptop computer, or a tablet computer.

6. The method of claim 1 further comprising:

identifying the user at a transaction terminal;

receiving a selection from the user for a registered biometric type;

activating biometric-enabled devices of the transaction terminal based on the registered biometric type;

receiving candidate biometric features captured by the biometric-enabled devices;

calculating candidate biometric measurements from the biometric features based on the registered biometric type;

generating a candidate biometric token from the candidate biometric measurements;

searching a list of pre-staged transactions for a match on the candidate biometric token and obtaining from the match the user identifier and the pre-staged transaction identifier for the pre-staged transaction; and

providing the transaction terminal pre-staged transaction details and the user identifier for processing the pre-staged transaction on behalf of the user.

7. The method of claim 6 further comprising, removing the candidate biometric token from memory and deleting the biometric token and the pre-staged transaction from the list of pre-staged transactions once the transaction terminal confirms the pre-staged transaction was processed on behalf of the user at the transaction terminal.

8. The method of claim 1 further comprising, instructing the transaction terminal to remove from memory and any storage of the transaction terminal, the candidate biometric features, the candidate biometric token, and the biometric token.

9. The method of claim 1 further comprising:

receiving the biometric token from a user at a transaction terminal;

identifying the selected biometric type associated with the biometric token;

searching a list of pre-staged transactions for a match on the biometric token;

obtaining the pre-staged transaction identifier, the user identifier for the user, and pre-staged transaction details from the match;

instructing the transaction terminal to capture biometric features of the user at the transaction terminal based on the selected biometric type;

receiving the biometric features from the transaction terminal;

generating a candidate biometric token from the biometric features based on the selected biometric type; and

providing the user identifier, the pre-staged transaction identifier, and the pre-staged transaction details to the transaction terminal along with instructions to process the pre-staged transaction on behalf of the user using the pre-staged transaction details when the candidate biometric token matches the biometric token.

10. A method, comprising:

registering, by a server, a user for biometric authentication based on a user-selected biometric type, biometric measurements calculated from biometric features captured for the user based on the user-selected biometric type, and based on a biometric token derived from the biometric measurements;

providing, by the server, the biometric token to a user-operated device;

deleting, by the server, the biometric token from memory and storage and retaining a user identifier and the user-selected biometric type as a registered user for the biometric authentication;

receiving, by the server, pre-staged transaction details for a pre-staged transaction and the biometric token from the registered user;

associating, by the server, a pre-staged transaction identifier for the pre-staged transaction details, the user identifier, the user-selected biometric type, and the biometric token together as an entry in a list of pre-staged transactions;

receiving, by the server, a notification that the registered user is present at a transaction terminal to perform the pre-staged transaction at the transaction terminal using the biometric authentication;

obtaining, by the server, the entry from the list of pre-staged transactions;

instructing, by the server, the transaction terminal to activate biometric-enabled devices of the transaction terminal and capture candidate biometric features of the registered user based on the user-selected biometric type;

receiving, by the server, the candidate biometric features from the transaction terminal;

calculating, by the server, candidate biometric measurements from the candidate biometric features based on the user-selected biometric type;

generating, by the server, a candidate biometric token from the candidate biometric measurements;

comparing, by the server, the candidate biometric token against the biometric token obtained from the entry in the list of pre-staged transactions; and

providing, by the server, the pre-staged transaction identifier and the pre-staged transaction details to the transaction terminal and authorizing the transaction terminal to process the pre-staged transaction on behalf of the registered user based on the comparing.

11. The method of claim 10 further comprising, deleting the entry from the list of pre-staged transactions from memory and storage when the transaction terminal confirms that the pre-staged transaction was processed on behalf of the registered user.

12. The method of claim 10 , wherein registering further includes instructing a user-operated device that is a phone, a laptop, a desktop, a wearable processing device, or a tablet to activate peripherals of the user-operated device and capture and provide the biometric features back to the server during a registration for the biometric authentication.

13. The method of claim 12 , wherein instructing the user-operated device further includes calculating, by the server, the biometric measurements from the biometric features based on the user-selected biometric type.

14. The method of claim 10 , wherein comparing further includes authenticating the registered user for performing the pre-staged transaction when the candidate biometric token is within a preconfigured tolerance range of the biometric token.

15. The method of claim 10 , wherein associating further includes generating a unique hash value associated with the pre-staged transaction identifier and the biometric token and retaining the hash value without retaining the biometric token with the entry and with list of pre-staged transactions.

16. The method of claim 15 , wherein comparing further includes generating a second unique hash value from the candidate biometric token and the pre-staged transaction identifier and comparing the unique hash value against the second unique hash value in place of comparing the candidate biometric token against the biometric token since the biometric token is missing from the entry and was replaced with the unique hash value.

17. A system, comprising:

a server comprising a processor and a non-transitory computer-readable storage medium;

the non-transitory computer-readable storage medium comprises executable instructions; and

the executable instructions when executed by the processor from the non-transitory computer-readable storage medium cause the processor to perform operations comprising:

registering a user as a registered user for biometric authentication by recording a user-selected biometric type with a user-identifier linked to a user account and by capturing biometric attributes of the registered user, calculating biometric measurements for the biometric attributes based on the user-selected biometric type, and generating a biometric token based on the biometric measurements;

providing the biometric token to the registered user;

receiving pre-staged transaction details for a pre-staged transaction that is being pre-staged by the registered user for the user account;

generating a pre-staged transaction identifier for the user-identifier and user account;

providing the pre-staged transaction identifier to the registered user;

generating a hash value using the pre-staged transaction identifier and the biometric token;

adding the user identifier, the pre-staged transaction identifier, the user-selected biometric type, and the hash value as an entry to a list of pre-staged transactions;

removing the biometric attributes, the biometric measurements, and the biometric token from memory and storage of the server;

receiving an indication from a transaction terminal that the registered user is present at the transaction terminal and provided the biometric token with the user-selected biometric type and the pre-staged transaction identifier;

instructing the transaction terminal to capture candidate biometric attributes using terminal peripheral devices based on the user-selected biometric type;

receiving the candidate biometric attributes from the transaction terminal;

calculating candidate biometric measurements from the candidate biometric attributes based on the user-selected biometric type;

generating a candidate biometric token from the candidate biometric measurements;

generating a second hash value using the candidate biometric token and the pre-staged transaction identifier;

obtaining the entry from the list of pre-staged transactions using the pre-staged transaction identifier; and

comparing the hash value of the entry against the second hash value and authorizing the transaction terminal to perform the pre-staged transaction on behalf of the registered user when the hash value is within a preconfigured tolerance range of the second hash value by providing the transaction terminal the user identifier and the pre-staged transaction details for processing at the transaction terminal.

18. The system of claim 17 , wherein the executable instructions when executed by the processor from the non-transitory computer-readable storage medium further cause the processor to perform additional operations comprising:

instructing the transaction terminal to delete from memory and storage of the transaction terminal the candidate biometric attributes; and

removing from memory and storage of the server the candidate biometric features, the second hash value, the candidate biometric measurements, the candidate biometric token, and the entry from the list of pre-staged transactions.