HTTPAPI and Json

["Raul A. Jager W." <raul@xxxxxxxxxx>]

I need to comunicate with Bancard for credit card payment, they 
installed a new sistem that uses json as protocol, and the manual 
requests a "post" whit the data in json format instead of the usual webform.

In the example2, the program builds a webform and sends it with 
http_url_post.
Can I build the json in a char variable and send it the same way?

A full description of the expected protocol is in:
https://www.bancard.com.py/docs/Manual_Tecnico_E-Commerce.pdf

Here I copied a small part where it explains that we must POST the Json, 
later on it gives all the detial of the data to send with each request.

_____________________________________________________________________________________________________
Peticiones realizadas por el portal a VPOS
Las peticiones serán realizadas por POST a una interfaz REST
public_key Clave pública del portal. En el caso de la confirmación, la 
key enviada es
también la del portal al cual se envía.
Datos de la operación que se va a llevar a cabo.
{
"public_key": "[public key]",
"operation": {
"token": "[generated token]",
...
}
}


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