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What you have amounts to $21.25 and a few extra gift points.
You cannot mix payment methods. It has to be all gift points, or all money.
What you can do is purchase enough gift points from the Shop/Gift Points to have enough total gift points to pay with gift points. And then make the purchase of the membership at Points/Shop with Gift Points. Gift points can be purchased in set increments, but you can purchase multiples of this or that in combinations to get as close to the amount you need as possible.
You'd also have to make 2 separate purchases of one year's membership to get an extension of two years.
1,399,500 x 2 - 200,000 = 2,590,000 GP
--> 2,500,000 GP for $250.00 + 100,000 GP for $10.00
Hope that helps.