Receiving cash back or discounts when purchasing with a credit card

Q:

1. When purchasing goods via a credit card, I received 1 rupee on every purchase of 200 rupees. Is this permissible or not?

2. Different offers are available on credit card and easy paisa accounts everyday. If we purchase and make some payments and order some food via the credit card and easy paisa account, then we will receive a special discount or cash back. Is this permissible or not?

If this is "sood" then what is best use of this amount.

Calculating haidh while doing IVF treatment

Q: In regards to my menses, I have a 28 day cycle... give or take. If I wipe and find a little change of colour on the toilet paper, I know I'll get my menses a couple of days later. Unfortunately, at the moment I've been having IVF treatments and I just stopped taking hormone replacement tablets and on to taking my injections, however, the nurse told me that my hormone medication and injections will overlap for 3 days and then I'll get my menses.

Now, this is the part I get confused because, the day she said that, which was a Wednesday, I had a few days before I thought I'd get my period, but on that day she said that, I saw a slight colour change on the toilet paper, anyway I still kept on praying because the day she said I get them was not the day I saw it, as I had a couple of more days before and I'm glad I did continue praying, because every other time I wiped it was clear and this happened to me for a couple of days, but yesterday, there were spots of blood on my underwear so, I washed and still prayed Dhur, but I again saw spots on my fresh underwear after changing them and now it was closer to the time when she said I was suppose to get them so, I didn't pray my maghrib, Isha or today's Fajr and now it's clear again and I've missed 3 salats and I'm upset!

What do I do in this situation and how can I make up these salats?

P.S. I feel if I do pray at the moment, I feel like I'm doing the wrong thing and if I don't pray at the moment, I feel like I'm still doing the wrong thing. 

Is Nabi (sallallahu alaihi wasallam) superior to the other Ambiyaa (alaihimus salaam)?

Q: Two persons, a Muslim and a Jew, quarrelled. The Muslim said, "By Him Who gave Muhammad superiority over all the people! The Jew said, "By Him Who gave Moosa superiority over all the people!" At that the Muslim raised his hand and slapped the Jew on the face. The Jew went to the Prophet and informed him of what had happened between him and the Muslim. The Prophet sent for the Muslim and asked him about it. The Muslim informed him of the event. The Prophet said, "Do not give me superiority over Moosa, for on the Day of Resurrection all the people will fall unconscious and I will be one of them, but I will be the first to gain consciousness, and will see Moosa standing and holding the side of the Throne (of Allah). I will not know whether (Moosa) has also fallen unconscious and got up before me, or Allah has exempted him from that stroke." (Buhari 3.41.594)

Please give me a description, I thought that Nabi Muhammad (sallallahu alaihi wasallam) is more superior than Nabi Moosa (alaihis salaam)