Upgrade
Dashboard → My plan or the Pricing page; choose monthly or yearly (yearly is discounted).
Coupons
Enter the code in the Coupon code field at checkout and click Apply; the discount shows in the total instantly. Coupons can be percentage or fixed, limited to certain plans and time-limited.
Payment methods
Credit / debit card (via iyzico, Stripe or PayTR), Google Pay and bank transfer. Bank transfers wait for approval after you upload the receipt.
Invoices
Invoices are available as PDF under Dashboard → Invoices. For company invoices fill in the company name and tax ID in your invoice profile.