# Read Query Param by Key

## Goal

Extract a specific query parameter value from the incoming link using `queryKeys` + `queryValues`.

## Actions Used

* `DeepLinkServicesOnUniversalLinkOpen` **or** `DeepLinkServicesOnCustomSchemeUrlOpen` (listener, persistent)
* `DeepLinkServicesGetUniversalLinkResult` **or** `DeepLinkServicesGetCustomSchemeResult` (extractor)

## Variables Needed

* queryKeys (Array: String)
* queryValues (Array: String)
* value (String) (example: campaignId / token)

## Implementation Steps

1. On listener `receivedEvent`, call the matching `Get*Result` action to populate `queryKeys` and `queryValues`.
2. Find the parameter:
   * Use PlayMaker Array actions to loop `i = 0..queryKeys.Length-1`
   * If `queryKeys[i] == "campaign"` then set `value = queryValues[i]`

## Example URLs

* Universal: `https://game.com/promo?campaign=summer2024`
* Custom scheme: `myapp://oauth-callback?token=xyz`

## Notes

`queryKeys` and `queryValues` are parallel arrays; use the same index for both.