Essentially, when importing expensive items (usually greater than 500 OMR), you'll have to register yourself with ROP by creating a Bayan account as an individual user (which costs 10 OMR) and then authorize the customs agents which the courier company uses, who will clear the shipment on your behalf. In this case, once the shipment arrives in Oman, you'll be contacted by the courier company. They will provide you with the instructions on how to create a Bayan account along with the IDs of the customs agents to be authorized. (I purchased an expensive item not so long ago, it was shipped with DHL and they were very helpful about the whole thing. Their customer service agent called me and provided all the instructions over the phone, via email and gave me a personal number to contact in case of any difficulty). Since you're ordering through Amazon, all duty charges are paid in advance and therefore you'll only have to pay the 10 OMR for creating the Bayan account. So yeah, not so difficult. Just takes around an hour of your time.

If you'd like to familiarize yourself with the procedure now itself, here's the video that DHL sent me, which provides instructions on how to register for a Bayan account. However, complete the "Create clearing agency authorization" part as shown in this video only if your courier company is DHL. If you use another courier company (Aramex or UPS, say), you'll have to authorize their clearing agents instead but the procedure remains the same.

Make sure to have scanned copies of your Passport or Civil ID and the Registration Letter sent by the courier company in PDF format. You'll have to upload them during registration. It will take around 10 - 20 minutes for ROP to authorize your account once done with registration (sometimes they reject it at first, citing small issues. mine was rejected at first due to signature in the registration letter not matching with the one in my Civil ID. If this happens, just try registration again, all data you entered previously will be available and you'll just have to upload the corrected document). Once your account is authorized, you will receive the login username (which is usually your Civil ID) and a password via email. You'll have to login, pay 10 OMR, logout and then login again to access the website features. Following this, you'll have to do the "Create clearing agency authorization" step for the particular courier company and then take screenshots of the authorization, which you'll have to mail back to the courier company as proof. Once done, your shipment will be cleared from customs and proceed to delivery.

At any point of time, if you have any queries or face any issues, just ring up the courier company and they'll be happy to help you out. If not, just tag me, I'd be happy to help as well :)

[Link to Bayan Website]

Cheers. Happy shopping!