Want to add a link on the page with some query parameter encoded with UTF-8 to base64

Hi @stephen.trumble ,

My Use-case is to sent a mail to customer, on which we will have a URL, this url is generated from the Klaviyo, while constructing the email, customer data will be picked and appended as a query parameter, but before appending, all customer information will be concatenated and encoded using {{urlencode}} and {{base64_encode}}. actually I am able to achieve the most part. but facing problem while trying to achieve below -

we have some customerdata i.e. useremail and country we need to append it with its key name.

eg. email=useremail+country=countryName refer this as encodedString, in this I am not able to concatenate variables, also not able to prepend a string (i.e. email=). so that I can encode whole string.

now encode this string with base64 and urlencode and paas the encoded string to below url as a value of query parameter 

eg . www.mydomain.com/myservice/params=encodedString

Did you ever find a solution to this? I have built this to enable Recharge Quick Actions in Klaviyo Flows to handle subscription actions. If you need some help reach out.