If we are using a Wi-Fi module procured from a module vendor and if we want to ship our product containing the module to multiple countries, how to obtain a per-product CLM blob?
See the Cypress Wi-Fi CLM regulatory process in https://www.cypress.com/documentation/application-notes/an225347-cypress-wi-fi-clm-regulatory-manual.
If you are using pre-certified reference design as well as antenna from a module vendor, you can obtain a reference per-product CLM blob from the module vendor. If you require changes of any form in the CLM blob, contact your module vendor for the specific changes.
If you are using a non-certified design or antenna design which is not tested by the module vendor, you cannot use the reference per-product CLM blob. Contact your module vendor for a new per-product CLM blob. The module vendor will undergo the CLM regulatory process as explained in the application note AN225347 in the link above and provide a new per-product CLM blob specific to your design.