def pay_for_a_plan_success(request,pending_purchase,context,user_existing_coupons,selected_plan):
# add the purchase to the database
new_purchase = Purchase()
new_purchase.user = pending_purchase.user
new_purchase.data_transfer_plan = pending_purchase.data_transfer_plan
if user_existing_coupons:
new_purchase.amount_paid = selected_plan.discounted_price
else:
new_purchase.amount_paid = selected_plan.original_price
new_purchase.remaining_allowance_frequency = pending_purchase.data_transfer_plan.freq
new_purchase.save()
# save follow_up number using hash
follow_up_number = generate_md5_hash(str(new_purchase.id))
new_purchase.follow_up_number = follow_up_number
new_purchase.save()
context['follow_up_number'] = follow_up_number
# if necessary, remove user's best coupon
if user_existing_coupons:
best_coupon = utility_functions.get_best_coupon(user_existing_coupons)
best_coupon.delete()
# send an email
plaintext = loader.get_template('payment/pay_for_a_plan_complete_email.txt')
htmly = loader.get_template('payment/pay_for_a_plan_complete_email.html')
subject = loader.get_template('payment/pay_for_a_plan_complete_email_subject.html')
subject_content = subject.render(context).replace('\n',' ')
text_content = plaintext.render(context)
html_content = htmly.render(context)
from_email = '*****@*****.**'
recipient_list = [new_purchase.user.email]
msg = EmailMultiAlternatives(subject_content, text_content, from_email, recipient_list)
msg.attach_alternative(html_content, "text/html")
msg.send()
# return response to the user.
return render(request,'payment/successful_payment.html',context)
