Error Creating Shipment for an Order in Ebay

Question

This error has plagued me for about a week now... I'm trying to create a shipment in Ebay but I'm getting a 500 error code in the response. Here is a link to the documentation https://developer.ebay.com/api-docs/sell/fulfillment/resources/order/shipping_fulfillment/methods/createShippingFulfillment

I'm running this code in the production environment:

  @header = {
    'Content-Type': 'application/json',
    'Authorization': "Bearer #{@token}"
  }

  uri = URI.parse("https://api.ebay.com/sell/fulfillment/v1/order/#{order.order_number}/shipping_fulfillment")

  # Create the HTTP objects
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true
  items = []
  order.items.each do |i|
    items << {"lineItemId": i[:id]}
  end
  params = {
    "lineItems": items,
    "shippedDate": Time.parse(date).strftime("%Y-%m-%dT%H:%M:%S.000Z"),
    "shippingCarrierCode": "USPS",
    "trackingNumber": tracking_number
  }

  request = Net::HTTP::Post.new(uri.request_uri, @header)


  request.body = params.to_json
  response = http.request(request)
  puts response.code #prints 500

My Error:

{"errors": [{
"errorId": 2003,
"domain": "ACCESS",
"category": "APPLICATION",
"message": "Internal error",
"longMessage": "There was a problem with an eBay internal system or process. Contact eBay developer support for assistance",
"parameters": [{
    "name": "reason",
    "value": "Failed to transform underlying error response, see logs."
}]
}]}

I paid for the premium developer support and I've yet to receive a response. Any help would be greatly appreciated. I've tried submitting the same request with an empty body but that doesn't change the response. I have also tried changing the headers. If I add 'Accept': 'application/json', then I get a 500 error with an empty body. It doesn't make any sense.

UPDATE

From the suggestions in the comments, I have tried changing the params hash to:

params = {
    "lineItems": "[{\"lineItemId\":10025031700524,\"quantity\":1}]",
    "shippedDate": "2020-05-01T08:05:00.000Z",
    "shippingCarrierCode": "USPS",
    "trackingNumber": "9400111899562795104724"
  }

I have also tried running subsequent requests. I have also tried submitting the following JSON in the body:

request.body = {
    "lineItems": [
      {
        "lineItemId": "10025031700524",
        "quantity": "1"
      }
    ],
    "shippedDate": "2020-05-01T08:05:00.000Z",
    "shippingCarrierCode": "USPS",
    "trackingNumber": "9400111899562795104724"
  }.to_json

Each of these attempts produces the exact same error as before. I've tried changing the quantity to an integer & string as well.

UPDATE 2

Here are the contents of my request:

POST /sell/fulfillment/v1/order/24-04954-08727/shipping_fulfillment
content-type: application/json
authorization: Bearer v#i^1XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX=
accept-encoding: gzip;q=1.0,deflate;q=0.6,identity;q=0.3
accept: */*
user-agent: Ruby
connection: close
host: api.ebay.com
content-length: 159
content-type: application/x-www-form-urlencoded
{"lineItems":[{"lineItemId":"10025031700524"}],"shippedDate":"2020-05- 01T08:05:00.000Z","shippingCarrierCode":"USPS","trackingNumber":"9400111899562795104724"}

Answer 1

In the request content:

POST /sell/fulfillment/v1/order/24-04954-08727/shipping_fulfillment
content-type: application/json
authorization: Bearer v#i^1XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX=
accept-encoding: gzip;q=1.0,deflate;q=0.6,identity;q=0.3
accept: */*
user-agent: Ruby
connection: close
host: api.ebay.com
content-length: 159
content-type: application/x-www-form-urlencoded
{"lineItems":[{"lineItemId":"10025031700524"}],"shippedDate":"2020-05- 01T08:05:00.000Z","shippingCarrierCode":"USPS","trackingNumber":"9400111899562795104724"}

It occurred to me that content-type is present twice.

After running some samples in irb it seems that the net/http library works with strings, not with symbols. By having a : in your @header definition the keys are interpreted as symbols.

To quote the Ruby documentation:

Hashes

A hash is created using key-value pairs between { and }:

{ "a" => 1, "b" => 2 }

Both the key and value may be any object.

You can create a hash using symbol keys with the following syntax:

{ a: 1, b: 2 }

This same syntax is used for keyword arguments for a method.

Like Symbol literals, you can quote symbol keys.

{ "a 1": 1, "b #{1 + 1}": 2 }

is equal to

{ :"a 1" => 1, :"b 2" => 2 }

See Hash for the methods you may use with a hash.

To use string keys use => instead of :.

For you that means changing:

@header = {
  'Content-Type': 'application/json',
  'Authorization': "Bearer #{@token}"
}

Into:

@header = {
  'Content-Type' => 'application/json',
  'Authorization' => "Bearer #{@token}"
}