CustomizationPHPGlobal variablesIntegrationsPaycekOn this pagePaycekES_API_KEY_PAYCEK This variable will set the Paycek integration API key. define('ES_API_KEY_PAYCEK', '<api-key>'); ES_PROFILE_KEY_PAYCEK This variable will set the Paycek integration profile key. define('ES_PROFILE_KEY_PAYCEK', '<profile-key>');