Meteor PayPal Payments (using Meteor.http) - meteor

Question

Edit: I've fixed my original problem and have shown a metor example in my answer.
I'm getting a error 500 when trying to get the token for my PayPal API app in Meteor:
token = EJSON.stringify(Meteor.http.call "POST", "https://api.sandbox.paypal.com/v1/oauth2/token",
headers:
"Accept": "application/json"
"Accept-Language": "en_US"
auth: "user:pass"
params:
"grant_type":"client_credentials"
);
console.log("Token: "+token);
Output of this code:
Token: {"statusCode":500,"headers":{"server":"Apache-Coyote/1.1","date":"Fri, 15 Mar 2013 05:04:43 GMT","content-length":"0","connection":"close"},"data":null,"error":{}}
Obviously PayPal is returning a error 500 to me. I can't figure out what may be causing this. Of course Auth is actual data, not user:pass.
Why am I getting error 500?
Edit: Compiled Javascript
var token;
token = EJSON.stringify(Meteor.http.call("POST", "https://api.sandbox.paypal.com/v1/oauth2/token", {
headers: {
"Accept": "application/json",
"Accept-Language": "en_US"
},
auth: "user:pass",
params: {
"grant_type": "client_credentials"
}
}));
console.log("Token: " + token);

Answer 1

Here's an example implementation to make paypal API calls with meteor.
In the startup of your program, fetch your token. Always replace clientid and clientsecret with your own.
token = EJSON.parse(Meteor.http.post("https://api.sandbox.paypal.com/v1/oauth2/token",
headers:
"Accept": "application/json"
"Accept-Language":"en_US"
auth: "clientid:clientsecret"
params:
"grant_type":"client_credentials"
#encoding: "base64"
).content).access_token;
Now, create a payment, shown here in a Meteor.methods method (and returning a URL for the client to go to):
buySingleItem: () ->
console.log "Starting new payment, user id: "+Meteor.userId()
result = Meteor.http.post("https://api.sandbox.paypal.com/v1/payments/payment",
headers:
"Authorization":"Bearer "+token
"Content-Type": "application/json"
data:
{
"intent":"sale"
"redirect_urls":
"return_url":"http://mysite.herokuapp.com/done",
"cancel_url":"http://mysite.herokuapp.com/cancel"
"payer":
"payment_method":"paypal"
"transactions":[
{
"amount":
"total":"3.00",
"currency":"USD"
"description":"My item description."
}
]
}
)
payment = result.data
console.log "PayPal redirect: "+payment.links[1].href
return payment.links[1].href
This will create a PayPal checkout style payment, within Meteor.

Answer 2

I would provide sample code, but I'm not familiar with Meteor.
Basically you have 2 issues here:
in your headers, you are not passing the client id or client secret. This should look like:
Authorization: Basic clientid:clientsecret
Also, in your request, your request should look like this:
response_type=token&grant_type=client_credentials
Looks like your in json then stringifying it, so whatever way you need to get the POST request I just put up there, once you get it, you should be good.
[edit]PayPal's doc's dont have you base64 encode the client id or secret[/edit]

Answer 3

Then, when you need to execute the payment you can do as below. See the whole payment process here.
Meteor.methods
'executePaypalPayment': (payerId) ->
payment = PaypalPayments.findOne({ userId: #userId },
{ sort: { 'create_time': -1 } })
token = Meteor.call 'getPaypalToken'
url = 'https://api.sandbox.paypal.com/v1/payments/payment/' +
payment.id + '/execute'
res = Meteor.http.post url,
headers:
Authorization: 'Bearer ' + token.access_token
'Content-Type': 'application/json'
data:
payer_id: payerId
payment = res.data
payment['userId'] = #userId
if payment.state is 'approved'
# we insert the sucessful payment here
PaypalPayments.insert payment
return if payment.state is 'approved' then true else false