Here is the situation:
US company, with all EU clients at this time (due to needing US approval that they are seeking).
What is the best way to take USD and convert to EU with Paypal?
Is there anyway to take an estimated weight and use Paypal to calculate shipping based on the country the buyer is from?
There isn't any sort of API that will show the Client the conversion rate. However the paypal SOAP specification allows you to specify the type of currency that is being paid with
https://www.paypal.com/en_US/ebook/PP_APIReference/architecture.html
PayPal-Supported Transactional Currencies The following currencies are supported by PayPal for use in transactions. Table 1.7
PayPal-Supported Currencies and Currency Codes for Transactions ISO-4217 Code
Currency AUD
Australian Dollar CAD
Canadian Dollar CHF
Swiss Franc CZK
Czech Koruna DKK
Danish Krone EUR
Euro GBP
Pound Sterling HKD
Hong Kong Dollar HUF
Hungarian Forint JPY
Japanese Yen NOK
Norwegian Krone NZD
New Zealand Dollar PLN
Polish Zloty SEK
Swedish Krona SGD
Singapore Dollar USD
U.S. Dollar Paypal doesnt have an API to calculate shipping either, you would need to create your own webservice that calculates the shipping cost, and interface that webservice with the paypal Instant Update API in order to provide your customers with shipping costs
About the Instant Update API
The Instant Update API is a server call to your web service that provides an instant update to the PayPal review page. It enables you to specify a URL for PayPal to call your web service with the buyer’s shipping address, so you can provide the buyer with more detailed shipping, insurance, and tax information. Note:
The Instant Update API enhances the Express Checkout flow from the shopping cart page.
The Instant Update API works as follows:
1.As the buyer logs in to PayPal, the PayPal server calls a URL to your web service with the buyer’s default shipping address as stored in the PayPal system.
2.Your callback server responds with the available shipping options for that address, along with any insurance options and tax adjustments on the order.
3.PayPal displays this information on the Review page so buyers can choose from the options.
4.The buyer’s final choices are returned in the GetExpressCheckoutDetails response.