fix: don't send payment reminder if member has already paid later

lms/lms/doctype/lms_payment/lms_payment.py

@@ -33,9 +33,24 @@ def send_payment_reminder():
 	)
 
 	for payment in incomplete_payments:
+		if has_paid_later(payment):
+			continue
+
 		send_mail(payment)
 
 
+def has_paid_later(payment):
+	return frappe.db.exists(
+		"LMS Payment",
+		{
+			"member": payment.member,
+			"payment_received": 1,
+			"payment_for_document": payment.payment_for_document,
+			"payment_for_document_type": payment.payment_for_document_type,
+		},
+	)
+
+
 def send_mail(payment):
 	subject = _("Complete Your Enrollment - Don't miss out!")
 	template = "payment_reminder"