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Variable precedence in Requestly ensures that when multiple variables with the same name exist, the most relevant one is chosen based on scope. The precedence order is as follows:
Environment Variables → SubCollection Variables → Collection Variables → Global Variables
In other words:
  • Environment variables always take the highest priority and override any variable with the same name in other scopes.
  • If no matching environment variable exists, Requestly checks for the variable in the collection scope.
  • Global variables serve as a fallback when the variable is not found in the environment or collection scopes.
This approach simplifies managing configurations across different use cases, ensuring that environment-specific values are prioritized without interfering with globally defined values. Or in developer’s languages: 
Copyif (variable_name in environment_variables) {        //Check in environment
    return environment_variables[variable_name];
} else if (variable_name in collection_variables) {  //Check in collection
    return collection_variables[variable_name];
} else if (variable_name in global_variables) {      //Check in global
    return global_variables[variable_name];
} else {
    return null; // Variable not found in any scope
}

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Example Scenario

Let’s say the variable {{base_url}} is defined in multiple places:
ScopeValue
Globalhttps://global.api.com
Collectionhttps://collection.api.com
SubCollectionhttps://sub.api.com
Environmenthttps://env.api.com
If you send a request inside the SubCollection with an active Environment, the variable {{base_url}} will resolve to https://env.api.com because environment variables have the highest precedence.