The setting of param into URL or its removing.
Parameters:

Name Type, value Description
param String, required The name of the parameter
value String A new value. If it is not given, the parameter will be removed from URL

Example:

Set url http://site.com?product=mp3player&vendor=samsung
# Set parameter "vendor" to "joe"
Filter UrlSetParam url WithParams param=vendor value=joe
# Add new parameter "ref" and set it value  to "mike"
Filter UrlSetParam url WithParams param=ref value=mike
# Show the result
Dump url
# Remove parameter "vendor"
Filter UrlSetParam url WithParams param=vendor
# Show the result
Dump url

Result:

url => http://site.com?product=mp3player&vendor=joe&ref=mike
url => http://site.com?product=mp3player&ref=mike

UrlGetParam Standart Filters WpFormat

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