I would like to provide some clarification about the Donation Identification Number (DIN) and the printing of the check character. Whenever the DIN is printed, it must be accompanied by a check character. The check character is not part of the DIN itself and it is not encoded into the DIN bar code. The check character should be enclosed in a box when printed to distinguish it from the DIN. The flag characters are separate from the check character, and neither are part of the Donation Identification Number itself. To help distinguish them from the actual DIN, the flag characters should be rotated 90° clockwise and the check character enclosed in a box. Here are some references on the ICCBBA website for the check character: ISBT 128 Standard Technical Specification Version 4.5.0Section 2.4.1 – Donation Identification Number [Data Structure 001] Section 7.6.2 – Keyboard Entry Check Character K United States Consensus Standard Version 3.0.0 Draft YSection 4.1 – Donation Identification Number [001]Section 4.1.1.4 – Keyboard Entry Check Implementation Guide: Use of the Donation Identification Number Version 1.0.0(You will need to have password access to the ICCBBA website to view this document) Section 3 – Check Character Section 4 – Text Associated with the DIN Erwin Cabana ICCBBA