[1ST] commit

Author: efairon

README.md

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 # promptpay
 Generate QRCode for Thai Promptpay
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+Golang API to generate QRCode
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+## Documentation
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+EMV QR Code specification: https://www.emvco.com/wp-content/plugins/pmpro-customizations/oy-getfile.php?u=/wp-content/uploads/documents/EMVCo-Consumer-Presented-QR-Specification-v1.pdf
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