What is the ruling on contracts of sale, lease, and the like that are conducted through modern inventions such as the Internet, and how is the contracting session held in this case?

The contract is Islamically concluded by offer and acceptance, along with the fulfillment of the legal conditions and the absence of impediments. With the development of communication methods, jurists have ruled the following:

1. Contracting between absentees (writing, letter, fax, computer): The contract is concluded when the offer reaches the other party and is accepted by him. 2. Contracting between present parties in distant locations (telephone, wireless): This is considered contracting between present parties, and the original jurisprudential rulings apply to it. 3. Offer with a specified duration: If the offeror issues an offer with a specified duration, he is bound to uphold his offer and cannot retract it during that period. 4. Exceptions: These rules do not include marriage contracts (due to the condition of witnessing), currency exchange (due to the condition of immediate possession), and salam contracts (forward buying) (due to the condition of immediate payment of the principal). 5. Counterfeiting, forgery, or error: In such cases, reference is made to the general rules of evidence.