Client ID (also known as Brand ID) is an identification number for your brand account. Client ID is used for authentication purposes in the context of technical integration and reporting an issue to DOKU Care.
Note for DOKU v1 Merchants
Client ID is similar to Mall ID, but you will only need to use Client ID if you would like to integrate with new payment methods. Both Client ID and Mall ID can be used in a case where you need to report any issue to DOKU Care. You may include your Client ID or Mall ID in your message.