I need to build web application where users can sell goods. Each user should be able to get money directly on his PayPal account. Can you suggest which PayPal service/payment method (or other payment system) it is better/safely to use in this case?
Thanks in advance
You can use ExpressCheckout, this means that your sellers do not need tho have Pro accounts, but login and payment will occur in paypal's popup window. You can also use more advanced integration, but this might require the merchants to upgrade their account, and this might cost them money in every month.
You also need to collect API keys from merchants and store them in a very safe location, or collect the money yourself, and pay for the merchants using paypal's API code, but this will introduce additional (transfer) costs.
You will most likely have to write it from scratch. I mean, from some bare framework.