Write the message of the donor of the project with the title of Lets Share Ideas who paid with a credit card.
message of the donor refer to donation_message; Lets Share Ideas refer to title; paid with a credit card refer to payment_method
SELECT T3.donation_message FROM essays AS T1 INNER JOIN projects AS T2 ON T1.projectid = T2.projectid INNER JOIN donations AS T3 ON T2.projectid = T3.projectid WHERE T1.title = 'Lets Share Ideas' AND T3.payment_method = 'creditcard'