Buying Basic plan & Payout currency for checkout

[Jordanker]

I'm from Singapore and my payment for the Shopify basic plan keeps on getting rejected even though my local bank's co-branded Visa debit card allows for recurring payments in USD, and it has international capabilities. Now it only displays "You tried to add a payment method too many times. Please contact support". 

My free trial ends tomorrow, could someone please help me with solving this problem asap?

Also, I plan on connecting my GoDaddy .us domain to my Shopify store with hopes of targeting the US market. However, as I am not residing in the US, I do not have a SSN and am unable to open a LLC/apply for an EIN, so I registered sole proprietorship in Singapore.

I know I can change the store currency, but I would like to confirm if the payout currency can be changed to USD as well? Will adding my global multi-currency debit card that accepts payouts in USD to the banking information in store settings automatically change the payout currency to USD for my US customers? 

Lastly, how can I enable STRIPE and Amazon pay as payment providers for Shopify payments in my region?