Created
February 9, 2021 06:29
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SGQR payload generator
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| from pycrc.algorithms import Crc | |
| def generate_qr_string(uen, is_uen, company_name, transaction_id, amount, editable, expiry): | |
| merchant_values = [ | |
| '00' + str(len('SG.PAYNOW')).zfill(2) + 'SG.PAYNOW', | |
| '01' + str(len(is_uen)).zfill(2) + is_uen, # 0 for mobile, 2 for UEN | |
| '02' + str(len(uen)).zfill(2) + uen, # uen / mobile number | |
| '03' + str(len(editable)).zfill(2) + editable, # 1 = editable, 0 = not editable | |
| '04' + str(len(expiry)).zfill(2) + expiry, # YYYYMMDD | |
| ] | |
| merchant_info = ''.join(merchant_values) | |
| additional_value = ['01' + str(len(transaction_id)).zfill(2) + transaction_id] # bill/ref number | |
| additional_info = ''.join(additional_value) | |
| values = [ | |
| '00' + str(len('01')).zfill(2) + '01', | |
| '01' + str(len('12')).zfill(2) + '12', | |
| '26' + str(len(merchant_info)).zfill(2) + merchant_info, | |
| '52' + str(len('0000')).zfill(2) + '0000', # merchant category code, not used | |
| '53' + str(len('702')).zfill(2) + '702', # SGD currency | |
| '54' + str(len(amount)).zfill(2) + amount, # transaction amount | |
| '58' + str(len('SG')).zfill(2) + 'SG', # 2 letter country code | |
| '59' + str(len(company_name)).zfill(2) + company_name, # company name | |
| '60' + str(len('Singapore')).zfill(2) + 'Singapore', # Merchant City | |
| '62' + str(len(additional_info)).zfill(2) + additional_info, | |
| '6304' | |
| ] | |
| qr_string = ''.join(values) | |
| # Sample code from https://pycrc.org | |
| crc = Crc(width=16, poly=0x1021, | |
| reflect_in=False, xor_in=0xffff, | |
| reflect_out=False, xor_out=0x0000) | |
| my_crc = crc.bit_by_bit_fast(qr_string) # calculate the CRC, using the bit-by-bit-fast algorithm. | |
| crc_data_upper = ('{:04X}'.format(my_crc)) | |
| final_string = qr_string + crc_data_upper | |
| return final_string | |
| # end def |
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