Methods and systems to pay using unique string

A server system in a payment network, the server system configured to facilitate a payment transaction from an issuer account of a user to an acquirer account of a merchant without swiping or entering card details of a payment card at a merchant interface of the merchant, the server system comprising:

• a communication interface configured to receive a payment transaction request comprising at least a payment string uniquely associated with the payment card linked with the issuer account and a transaction amount to be paid to the merchant;
• and
• at least one processor in operative communication with the communication interface, the at least one processor configured to:
• verify a validity of the payment string based on at least one rule set;
• upon successful validation of the payment string, retrieve issuer account information associated with the issuer account based on at least a part of the payment string;
• and
• facilitate the payment transaction based at least on the retrieved issuer account information from the issuer account to the acquirer account.

A server system in a payment network, the server system configured to facilitate a payment transaction from an issuer account of a user to an acquirer account of a merchant without swiping or entering card details of a payment card at a merchant interface of the merchant, the server system comprising:

• a database comprising a mapping table, the mapping table configured to store mapping of a plurality of predefined length alphanumeric codes and a plurality of issuer account information associated with a plurality of users;
• a communication interface configured to receive a payment transaction request comprising at least a payment string uniquely associated with the payment card linked with the issuer account and a transaction amount to be paid to the merchant, the payment string comprising a predefined length alphanumeric code of the plurality of predefined length alphanumeric codes;
• a memory comprising executable instructions;
• and
• a processor communicably coupled to the communication interface and the database, the processor configured to execute the instructions in the memory to cause to the server system to:
• verify a validity of at least the predefined length alphanumeric code of the payment string based on at least one rule set;
• upon successful validation of the predefined length alphanumeric code, retrieve an issuer account information associated with the issuer account based on matching the predefined length alphanumeric code in the mapping table;
• and
• facilitate the payment transaction based at least on the retrieved issuer account information from the issuer account to the acquirer account.