Verify Paystack Payments in Spring Boot

@Transactional
public boolean verifyAndFulfill(String reference) {
    Order order = orderRepository.findByReference(reference);
    if (order == null) return false;
    if (order.isPaid()) return true;

    Map<String, Object> result = verifyTransaction(reference);
    if (!Boolean.TRUE.equals(result.get("status"))) return false;

    Map<String, Object> data = (Map<String, Object>) result.get("data");
    if (!"success".equals(data.get("status"))) return false;

    int paystackAmount = ((Number) data.get("amount")).intValue();
    if (paystackAmount != order.getAmountKobo()) return false;

    // Atomic update
    int updated = orderRepository.markAsPaid(reference);
    return updated > 0;
}

// In OrderRepository:
@Modifying
@Query("UPDATE Order o SET o.paid = true, o.paidAt = CURRENT_TIMESTAMP WHERE o.reference = :ref AND o.paid = false")
int markAsPaid(@Param("ref") String reference);

@GetMapping("/verify")
public ResponseEntity<?> verify(@RequestParam String reference) {
    boolean success = paystackService.verifyAndFulfill(reference);
    if (success) {
        return ResponseEntity.ok(Map.of("success", true));
    }
    return ResponseEntity.badRequest().body(Map.of("success", false));
}

This guide is part of the Paystack integration guides by language and framework series.

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