What are some techniques that a merchant server can pass order to the bank payment system?

When a user is shopping online and wants to buy some items from an online store. What are two techniques (Not products or services) by which the merchant server can pass the order number, order amount and other details to the bank's payment system? Are there any security exposures along with advantages and... show more When a user is shopping online and wants to buy some items from an online store.

What are two techniques (Not products or services) by which the merchant server can pass the order number, order amount and other details to the bank's payment system?

Are there any security exposures along with advantages and disadvantages for each?
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