Question Summary:
Purchases through friend’s credit card.

Question Detail:

Assalaamu Alaikum,
Is it permissable to ask a friend who has Credit Card to use and do purchase for which I will pay back to the friend by cash, the same amount he gave through Credit Card, However, I believe and trust that using Credit Card is haraam...but I consider this particular deal is with him and me, and not the Bank.
Please clarify this as soon as possible.

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
It is permissible for you to use your friend’s credit card facility to pay for you on condition that your friend will make timeous payment for your purchase and avoid incurring interest due to your purchase. [1] [2] [3] [4] [5] 
And Allah Ta’āla Knows Best
Anas Sharieff Qasmi.
Student Darul Iftaa
Hyderabad, India.

Checked and Approved by,
Mufti Ebrahim Desai.

______________________

[1]فإن وكله أن يشتري له عبدا مولدا ......سمي جنسا من الأجناس فإن ذلك جائز.[كتاب الأصل:٢٥٨/١١]
 
[2]كنز الدقائق (ص: 485)
أمره بشراء ثوبٍ هرويٌّ أو فرسٍ أو بغلٍ صحّ سمّى ثمنًا أو لا 
 
[3]الدر المختار شرح تنوير الأبصار وجامع البحار (ص: 500)
(وكله بشراء ثوب هروي أو فرس أو بغل صح) بما يحتمله حال الآمر
[4]
Contemporary Fatawaa [178/9]
[5]
المبسوط للسرخسي (12/ 109)
 {وحرم الربا.} [البقرة:527[