"Pay later" is a service offered by Swissbilling, an official partner of 麻豆社 TWINT. Swissbilling is accountable for processing the "Pay later" purchases you make via the 麻豆社 TWINT App. Therefore, you will receive emails and other notifications from Swissbilling.
As the issuer of your 麻豆社 TWINT App, 麻豆社 is not involved with and assumes no liability for "Pay later".