I just noticed this. Thank you for the quick response.

Again, Thanks for the response. I briefly reviewed the functionality in the paypal and ogone module. It appears the payment_acquirer module is designed to post form data to an external payment gateway to complete the payment. I am developing an Authorize.net module. I already have the api calls completed, and am looking at the best way to implement them in odoo 8. I do not understand how this could work. What I need is the ability to submit a call and interpret the response. I would also need to do things like capture, authorize + capture, etc. I could be wrong but this doesn't seem possible with the current acquirer functionality. Additionally, I was not able to locate any official documentation. If you could enlighten me on how I could accomplish these goals I would proceed with developing a payment acquirer, else I would probably just implement the api using the old fashioned journals and the new wizard for registering payment.

To clarify, the current functionality will redirect the browser to complete the payment, which is different that what I need it to do. I would submit a post to the external gateway, and register payment if it was successful. Additionally, the call needs to be configurable, like the user selects authorize and then presses the payment button.

Odoo out of the box allows to do what you mention. Not only does it work with Authorize.net (https://github.com/odoo-dev/odoo/tree/8.0-payment-authorize-aja), but you can capture the transaction's success or failure call back in Odoo to create the payment and reconcile it with its invoice. And you can still do so even by using the gateway's page to process the payment. We have done that for several of our clients.