Form builder with payment gateway

• Class and course tuition

  Combine the registration form with tuition payment; registration is confirmed only after a successful payment.

• Order form

  Collect the product and quantity in the form, total the amount with a calculated field and take payment right there.

• Donations

  Let the payer choose the amount; whatever they enter in the amount field goes to the gateway.

• Paid events and exams

  Charge attendance fees for conferences and workshops; in the exam builder you can make exam entry paid too.

Nothing gets installed anywhere: send the short link or QR, or place the iframe code on any site, including your own WordPress site. For course enrollment, see theOnline registration formas well.

The payment amount works two ways: fixed, or read from a field. For the second, add a “calculated” field and write its formula referencing other fields' keys inside double curly braces:

The formula runs in a restricted, safe engine that recognizes only math operations and allowed functions, and the server recalculates the amount at submission — so nobody can pay less by tampering with the browser. The display unit is toman or rial, and the amount always goes to the gateway in rials. Conditional logic can act on the amount too; for example, require a pro forma upload when the total exceeds a threshold.

The biggest risk with a payment form is recording an order that was never paid for. In Porsino a response stays in “awaiting payment” until the payment is confirmed. When the payer returns from the gateway, the server itself queries the gateway for the transaction and never accepts any parameter returned from the browser as proof of payment.

• Successful payment: the response is finalized and receives a unique invoice number.
• Failed or abandoned payment: the payer can try again from the result page.
• Payment deadline passed: the unfinished response is set aside and option capacity, booked slots and discount-code quotas are released.

In the dashboard, each form's Payments section shows the status of every transaction, and if needed you can re-query a payment's status from the gateway.

After a successful payment, the result page shows the amount, discount, gateway, bank reference number, invoice number and payment time, and a “Download invoice” button gives the PDF invoice. Enter the seller's name, address, tax ID and logo in the form's payment settings so they appear on the invoice.

Discount codes are included: percentage or fixed amount, with a usage cap, expiry date and minimum purchase. Each code's usage is counted atomically, so two simultaneous purchases can't exceed its cap.

Gravity Forms is a powerful commercial WordPress plugin. If you have a WordPress site and the form has to integrate with that site's users, products or other plugins, it's a sensible choice.

In short: if you don't have WordPress, or don't want to maintain a plugin and its license, Porsino is the shorter route; if everything you run is on WordPress, Gravity Forms is a good option too.