Activation instructions:

1. The key received after payment must first be activated on the site https://www.callofduty.com/
1.1 Create a new account on the site https://www.callofduty.com/ or log in to an existing one.
1.2 Depending on the platform on which you are going to play (XBOX One / PC / PS), you must first link your platform account to your account on the site https://www.callofduty.com/. This is done at https://profile.callofduty.com/cod/profile
In particular, if you plan to play through battle.net, then you need to link your battle.net account to your callofduty.com account.
2. After linking your account/your platform to callofduty.com, you go to the page
https://profile.callofduty.com/promotions/redeemCode/mw-preorder?fromLogin=true , select your platform there, enter the purchased key in the field, select the country
3. Depending on the chosen platform, you will be given a key already for your chosen platform. In particular, for playing through battle.net - you will be given a key for battle.net on the site https://profile.callofduty.com/promotions/redeemCode/mw-preorder?fromLogin=true.
After receiving the key, go to your battle.net account -> https://kr.battle.net/shop/ru/checkout/key-claim and activate the key received from callofduty.com.
For other platforms - the procedure is similar - choose a platform, callofduty.com will give you a key for it. Activate the newly received key on your platform.

Notes:
1) When activating the purchased key, various errors are possible on the site callofduty.com, directly related to this site, the load on this site. If errors appear, check the activation status on the page:
https://profile.callofduty.com/promotions/redeemCode/mw-preorder
2) In Russia (for Russian ip) access to the site https://profile.callofduty.com/ is limited. You need to use vpn/proxy of another country (Europe or USA) to register/authorize on callofduty.com