@walletfactory/emvqr/emvqr/scheme.js

Decode emv qr code specification for payments

const scheme = {
  '00': {
    name: 'Payload Format Indicator',
  },
  '01': {
    name: 'Point of Initiation Method',
  },
  '02-51': {
    name: 'Merchant Account Information',
    scheme: {
      '00': {
        name: 'Globally Unique Identifier',
      },
      '01-63': {
        name: 'Context Specific Data',
      },
    }
  },
  '52': {
    name: 'Merchant Category Code',
  },
  '53': {
    name: 'Transaction Currency',
  },
  '54': {
    name: 'Transaction Amount',
  },
  '55': {
    name: 'Tip or Convenience Indicator',
  },
  '56': {
    name: 'Value of Convenience Fee Fixed',
  },
  '57': {
    name: 'Value of Convenience Fee Percentage',
  },
  '58': {
    name: 'Country Code',
  },
  '59': {
    name: 'Merchant Name',
  },
  '60': {
    name: 'Merchant City',
  },
  '61': {
    name: 'Postal Code',
  },
  '62': {
    name: 'Additional Data Field Template',
    scheme: {
      '01': {
        name: 'Additional Data Field',
      },
      '02': {
        name: 'Additional Data Field',
      },
      '03': {
        name: 'Additional Data Field',
      },
      '04': {
        name: 'Additional Data Field',
      },
      '05': {
        name: 'Additional Data Field',
      },
      '06': {
        name: 'Additional Data Field',
      },
      '07': {
        name: 'Additional Data Field',
      },
      '08': {
        name: 'Additional Data Field',
      },
    }
  },
  '63': {
    name: 'CRC',
  },
  '64': {
    name: 'Merchant Information— Language Template',
  },
  '65-79': {
    name: 'RFU for EMVCo',
  },
  '80-99': {
    name: 'Unreserved Templates',
  },
}

const getTag = (tagId) => {
  const tag = scheme[tagId]

  if (!tag) {
    const id = parseInt(tagId)

    switch (true) {
      case id >= 2 && id <= 51:
        return scheme['02-51']
      case id >= 65 && id <= 79:
        return scheme['65-79']
      case id >= 80 && id <= 99:
        return scheme['80-99']

      default:
        return
    }
  }

  return tag
}

const getSubTag = (tagId, subTagid) => {
  const tag = getTag(tagId)

  if (!tag || !tag.scheme) {
    return
  }

  const subTag = tag.scheme[subTagid]

  if (!subTag) {
    const id = parseInt(subTagid)

    switch (true) {
      case id >= 1 && id <= 63:
        return scheme['01-63']
      default:
        return
    }
  }

  return subTag
}

module.exports = {
  getTag,
  getSubTag
}