A unique identifier used to identify the user when making server-to-server reward callbacks.
This value will be passed as a parameter of the callback URL to the publisher’s server.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2021-03-03 UTC."],[],[],null,["# GoogleMobileAds Framework Reference\n\nGADServerSideVerificationOptions\n================================\n\n @interface GADServerSideVerificationOptions : NSObject \u003cNSCopying\u003e\n\nOptions for server-to-server verification callbacks for a rewarded ad.\n- `\n ``\n ``\n `\n\n ### [userIdentifier](#/c:objc(cs)GADServerSideVerificationOptions(py)userIdentifier)\n\n `\n ` \n A unique identifier used to identify the user when making server-to-server reward callbacks.\n This value will be passed as a parameter of the callback URL to the publisher's server. \n\n #### Declaration\n\n Objective-C \n\n @property (readwrite, copy, nonatomic, nullable) NSString *userIdentifier;\n\n- `\n ``\n ``\n `\n\n ### [customRewardString](#/c:objc(cs)GADServerSideVerificationOptions(py)customRewardString)\n\n `\n ` \n Optional custom reward string to include in the server-to-server callback. \n\n #### Declaration\n\n Objective-C \n\n @property (readwrite, copy, nonatomic, nullable) NSString *customRewardString;"]]
