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           efrain | 
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           <?php
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           namespace Packback\Lti1p3\Interfaces;
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           interface ICache
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           {
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               public function getLaunchData(string $key): ?array;
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               public function cacheLaunchData(string $key, array $jwtBody): void;
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               public function cacheNonce(string $nonce, string $state): void;
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               public function checkNonceIsValid(string $nonce, string $state): bool;
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               public function cacheAccessToken(string $key, string $accessToken): void;
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               public function getAccessToken(string $key): ?string;
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               public function clearAccessToken(string $key): void;
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           }
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