Plans, payment and invoices
Live plan prices are always on the pricing page.
Purchase & renewal: from your account's billing section, pick a plan and complete the payment. Renewal is periodic (monthly).
Invoices: every payment yields a receipt and a PDF invoice in the billing section; register your organization's legal details once and they appear on all invoices.
Upgrades/downgrades: upgrades are instant and prorated; downgrades apply next cycle.
Balance & usage: usage charts and remaining quota live in the same section.