Valid & Invalid transactions

Q: I own a butcher shop. When we weigh the meat, we weigh it with the plastic and the tray, and we charge him accordingly. Is this fine?

Q: 

1. I sell products from my business website. My supplier has 200 products. I stock 100 items but list all 200 items on the website stating 'available on order'. The customer purchases and pays for the item and I then order and ship it to the customer. Is this permissible? 

2. I post items on my WhatsApp for sale... Customers know I don't have the product. The supplier has numerous agents like myself who advertise and purchase according to order. Customers place orders and once I receive the item, they pick up and pay. Is this permissible or how can this be structured in a permissible manner?

Q: I get many customers who are either semi-drunk or completely intoxicated. Will it be permissible to sell to them? 

Q: Please clarify the following: 

We have booked and paid for a hotel breakfast. Is it permissible to take food items to my room that I am unable to eat in the breakfast room but will eat a little later.

Q: Is forex trading permissible?

Q: I have a question about a certain crypto exchange group called “mega”. Basically it’s a group that trades in a platform called “2139 exchange”. Me and my friends group joined this group because we did our research and we didn’t find anything haraam concerning it. But now I’m having some doubts. 

Basically a certain individual studies the market and predicts the direction of a certain currency and makes profits through the price fluctuations. The participants can join the trade through a futures feature and get a profit but he takes a percentage also when the participants withdraw their profits he also takes a percentage. So I want to know if it’s halaal or haraam because I heard some people saying it’s like gambling. 

Q: Could mufti advise on the following: 

Person A owns a Cash n Carry, person B and person C both are his customer's and purchase from him. At the premises of person A, person B and C meet and start transacting on person A's premises. Person A in turns tells Person B that person C is my customer and you cannot supply him. 

1. Is this type of clause permissable in shariah where person A stops person B from supplying person C as he feels it's his customer. 

2. If person B and C transacted on person A's property, is the sale valid.

Q: I need clarification on giving good paid reviews to a website. 

The previous week one individual from UK reached me on WhatsApp to start working on a website called intrepid travelling links. I worked about 3 hours giving reviews to the site. They pay us using bitcoin which we will convert to our local banks. I think the company pays for good reviews to boost their ratings. Is it halal? 

By giving reviews. Should I use it. Continue work or leave it. Reviews are given after using company services but they do this way. Should I use it regularly. Or I should work and spend the money on needy people? Kindly share as per Shariah.

Q: If a person does not own any products, he cannot sell them according to the hadith. But what will be the ruling for customized products which are made on order? 

For example, furniture, customized packagings, custom business cards, custom printed clothes and many other things which are made only on order. These things cannot be kept in stock, because every product is made as per customer's requirements. Such products are neither with the seller nor with any factory. Because such products can be made only when the customer places the order, as per customer's requirements. 

So my question is whether I can take the order from the customer as per my price and give it to the factory? And can I take the full money from the customer in advance? Please clear my doubt.

Q: Regarding online trading, be it a commodity or currency, it is been said that it's not permissible based on both exchanges being deferred and if 1 exchange is deferred and the other is not then is it permissible? 

Can you explain further what is meant by deferred exchanges?