It does not matter who you bank with: TWINT is available to everybody. Ideally, you should select the TWINT app of a bank with which you have an account. This will allow you to link the app to your bank account.
Send download link directly to smartphone
By making the entry, you expressly issue your consent for TWINT to use this number for the one-time delivery of the app download link. Your mobile number shall not be used for any further purposes and shall be deleted after the notification has been delivered.