fix: Update Content-Type header to application/x-www-form-urlencoded

[BiswaViraj]

What change does this PR introduce?

• fixed Gupshup provider request format to use form-encoded
• Gupshup docs

Why was this change needed?

Other information (Screenshots)

[linear]

NV-3544 Update Gupshup provider payload request

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[LetItRock]

shouldn't we send the data in the URL according to their documentation? and I'm not sure about the POST method.
Btw the URL should start with https.

[BiswaViraj]

var request = require("request");
var options = { method: 'POST',
url: 'https://enterprise.smsgupshup.com/GatewayAPI/rest',
form:
{ method: 'sendMessage',
send_to: '919820XXXXXX',
msg: 'This is sample test message from GupShup',
msg_type: 'TEXT',
userid: 'XXXXXX',auth_scheme: 'PLAIN',
password: 'XXXXX',
format: 'JSON' } };
request(options, function (error, response, body) {
if (error) throw new Error(error);
console.log(body);
});

import requests
url = "https://enterprise.smsgupshup.com/GatewayAPI/rest"
payload =
"method=sendMessage&send_to=919820XXXXXX&msg=This%20is%20sample%20test%20message%20from%20
GupShup&msg_type=TEXT&userid=XXXXXX&auth_scheme=PLAIN&password=XXXXX&format=JSON"
response = requests.request("POST", url, data=payload)
print(response.text)

@LetItRock They support both GET and POST method. I took the example from their Node and Python codes.
Should we update it to use GET instead?

[LetItRock]

@BiswaViraj I was assuming they support both :) all right let's leave it then :)