fetch customerId for myApiClient - node.js

Question

I am trying to fetch the customerId for myAPIClient using swift firebase and node.js. When I run my application it crashes and tells me that the customerId is nil. The reason that I am needing this customerId is in order to create the ephemeralKey.
The code that I use in node.js is,
exports.createEphemeralKey = functions.https.onRequest((req, res) => {
const stripe_version = req.body.api_version;
const customerId = req.body.customerId
if (!stripe_version) {
console.log('I did not see any api version')
res.status(400).end()
return;
}
stripe.ephemeralKeys.create(
{customer: customerId},
{stripe_version: apiVersion}
).then((key) => {
console.log("Ephemeral key: " + key)
res.status(200).json(key)
}).catch((err) => {
console.log('stripe version is ' + stripe_version + " and customer id is " + customerId + " for key: " + stripe_key + " and err is " + err.message )
res.status(500).json(err)
});
});
and the code that I am using inside of myApiClient is.
func createCustomerKey(withAPIVersion apiVersion: String, completion: #escaping STPJSONResponseCompletionBlock) {
let url = self.baseURL.appendingPathComponent("ephemeral_keys")
let defaults = UserDefaults.standard
let customerId = defaults.string(forKey: "customerId")
AF.request(url, method: .post, parameters: [
"api_version": apiVersion, "customer_id": customerId!
])
.validate(statusCode: 200..<300)
.responseJSON { responseJSON in
switch responseJSON.result {
case .success(let json):
completion(json as? [String: AnyObject], nil)
case .failure(let error):
completion(nil, error)
}
}
}
I have been stuck on creating this ephemeralKey for a while now and have asked other questions but have not gotten a real answer. Is there anything that I am missing? How can I actually access the customersId from stripe inside of my ios project.

Answer 1

You should first check that let customerId = defaults.string(forKey: "customerId") provides a valid customerId. You can do so by debugging your app and inspecting the value of customerId. Assuming that it is valid, I see a couple of things that may be causing issues for you:
The Alamofire library that you are using has 2 Parameter Encoders with different properties and options. You can see them here.
My hypothesis is that you are nor passing the customerId correclty to the body of the request. I suggest you start by trying the JSONParameterEncoder. Your request would be somehting like this:
AF.request(url, method: .post, parameters: [
"api_version": apiVersion, "customer_id": customerId!
],
encoder: JSONParameterEncoder.default)
It is possible that you also have to tweak the way your retrieve the customerID from the Cloud Function according to how you pass the info from the swift app. This docs may provide some insights on how to parse HTTP request info