# refer to https://ozow.com/integrations/ for more information

# Ordering with the params matters, see the link above for more information
ozow_params = {
  'SiteCode': 'SOME_SITE_CODE', # find this here https://dash.ozow.com/MerchantAdmin/Site
  'CountryCode': 'ZA', # only supports ZA currently
  'CurrencyCode': 'ZAR', # only supports ZAR currently
  'Amount': 1000, # this is R1000, not working well for floats though
  'TransactionReference': 'SOME_TEST', # your internal reference to match against
  'BankReference': "Nice Reference", # the reference that the customer will see on their bank statement
  'Optional1': nil,
  'Optional2': nil,
  'Optional3': nil,
  'Optional4': nil,
  'Optional5': nil,
  'Customer': nil,
  'CancelUrl': 'https://www.example.com/webhooks/ozow/success',
  'ErrorUrl': 'https://www.example.com/webhooks/ozow/error',
  'SuccessUrl': 'https://www.example.com/webhooks/ozow/success',
  'NotifyUrl': 'https://www.example.com/webhooks/ozow/notify' # needs to be an endpoint that accepts a POST request
  "IsTest": true, # pretty self explanatory
}

ozow_params = ozow_params.compact_blank
string = ozow_params.values.join('').downcase + "SOME_SECRET_KEY" # you'll find this here: https://dash.ozow.com/MerchantAdmin/Merchant/Details (Private Key)
ozow_params[:HashCheck] = Digest::SHA512.hexdigest(string)

base_url = 'https://pay.ozow.com'
# response should be a redirect (302) to a url that looks something like this: :uuid/Secure
response = HTTP.post(base_url, params: ozow_params)

# https://pay.ozow.com/:uuid/Secure
payment_url = base_url + response.headers['Location']

# you can either load payment_url into an iframe tag, or redirect to that page. Freedom of choice.