* Don't encode filter=

The query string for the buy api should not encode the = symbol. The `filter=` part of the query string has been removed outside of the `encodeURLQuery` function.

* constructAdditionalParams function
  Allow for array of options for multiple filter values
  eBay reference: Filters with Multiple Values - https://developer.ebay.com/devzone/finding/Concepts/FindingAPIGuide.html#useitemfilters

* fix conflict from unrelated merge conflict.

* test constructAdditionalParams
  now includes test for array of values for multiple filter values.

* Slightly improve readability of constructAdditionalParams

Co-authored-by: daveybrown <daveybrown@users.noreply.github.com>
Co-authored-by: Davey Brown <>

Add buyerPostalCode to the list of options that are a key and value query string pair.
eBay docs reference: https://developer.ebay.com/devzone/finding/callref/findItemsByKeywords.html

* Update buy-api.js

add epid in searchItems

* Update PULL_REQUEST_TEMPLATE.md

* Update PULL_REQUEST_TEMPLATE.md

* searchItems - fixes

* searchItems - allow search by epid

* Group filter parameters

This fixes an API error caused by any other parameter in between filter parameters.

Reference: https://forums.developer.ebay.com/questions/14689/error-value-is-required-for-item-filter-listing-ty.html

> Error: Value is required for item filter

> You're putting sortOrder in between two itemFilter parameters. Put the item filters together, in order. Move sortOrder to a different position.

* update expected test results, due to change

Update `getSingleItem` to accept object as parameter.