Shopify Payments

New Member
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Hello all, 

I have a scenario where 

1) customer ordered and made payment of the product.

2) now the customer has requested one more item to add to it, can i take remaining amount for the order from the trasaction api from same the credit card which is used by customer earlier, 

 is this api  call can be used for taking actual money from customer 

POST /admin/orders/#{order_id}/transactions.json

$data= array(
"currency"=> "USD",
"amount"=> "50",
"kind"=> "sale",

if not what will be solution to take remaining amount from api, is transaction api is just for virtual payments( taking payments outside and logging in shopify)