Contact person: Secure Payment Page with Browser Fingerprinting

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Location: HORNSBY, Australia

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need to update our Hosted Payment Page to enhance security using device fingerprinting. This is to protect sensitive information such as payment card information and transaction data.

The fingerprint is a protected record of the important details of requests coming to the Hosted Payments Page. It must be generated and then included as an input field to the HTML form. It prevents a customer modifying the transaction details when submitting their card information.
The Fingerprint is a HMAC-SHA256 hash of the following fields, plus the Merchant Transaction Password, in the same order with
a pipe separator “|”:
vendor_name
payment_reference
payment_alert
unit_names, which is a list of coma-separated product names in alphabetical order.
unit_prices, which is a list of unit prices in corresponding order with the product names above.
Merchant transaction password
If any field doesn’t have a value, an empty string will be used instead.
Merchant Transaction Password is used as the secret key when generating the fingerprint.
Computed values for unit_names and unit_prices are used to generate fingerprint and should not be submitted along with the
form." (client-provided description)