Samoa Air

I have booked a flight Savaii - Upolu on its website two days ago but I have yet to hear anything back from them about how to pay. I'm not sure how the process is after I got this email

Dear Ms/Mr ....

Thank you for your booking request. We are processing your E-ticket, please note:

Your order number for the booking is xxxxxx

Your contact details as mentioned is ........

The total for the fare is $ .... Tala for the sector/flight.

Your detail flight information is as follows:

How did you guys normally buy yours?