First make sure the purchase was successfully completed by your platform. Restart the game and check again. If the content is still missing, contact support@oilempire.info with the platform, approximate purchase date and order or transaction reference.

No. Never send complete payment-card information.

Eligible restorable purchases can be restored where supported by the platform and the type of purchase. Consumable items may not be restorable in the same way as non-consumable purchases.

The offer may be limited to one purchase, or the platform may already recognize it as purchased.

This depends on the purchase type, platform entitlement and whether the relevant game progress or entitlement has been successfully restored or synchronized.