CRM/EventParticipantPaymentcivicrm_participant_payment1.7trueCiviEvent id int unsigned true Participant Payment ID Number 1.7 id true participant_id int unsigned true Participant ID (FK) Participant 1.7 participant_id civicrm_participant id CASCADE contribution_id int unsigned true FK to contribution table. Contribution EntityRef 2.0 contribution_id civicrm_contribution id 2.0 CASCADE UI_contribution_participant true contribution_id participant_id 2.0