Just applied for chase sapphire preferred credit card & I must spend $3000 in 3 months to receive the sigh-in bonus of 40,000 miles. Here is my concern

Myself is the working person with full time job. The card is in my name & wife is added as an authorized user. After doing lot of research I have come to know that "Amazon Payment" is the most effective way to fulfill the $3000 spending requirement. My questions are:

1) Can I create an "Amazon Payment" for my wife on my own? Obviously we live together & share same address. Wife will never ever send me money (I will be the one who will do the work).

2) I will send $1000 each month to wife's "Amazon Payment" account & then will transfer the money to our joint HSBC checking account. If there any rules I must follow while transferring money to checking account? To be safe I will wait 1 week after "Amazon Payment" to "Amazon Payment" transaction.

3) I understand I need to provide wife's SSN to open "Amazon Payment" account. Will this cause any concerning when we file taxes end of the year? Wife a housewife with $0 income & she is my dependent.

4) Opening up "Amazon Payment" account just to meet the credit card minimum spending require is something I have done before & a bit worried thinking whether or not we will run into any problem in future with IRS?

5) I will opening out account at the same time after receiving the card. Will that raise any concern with Amazon or Chase or IRS?

At the end, I will close by myself saying that I will never even transfer more than $1000 between out "Amazon Payment" accounts & To be safe I will wait 1 week after "Amazon Payment" to "Amazon Payment" transaction. Please guide me if I am missing anything or breaking the Law. Any guidance or tips will be extremely appreciated.

Many Thanks In Advance.