Try on mainnet or using testnet to test using fake money.
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Open Payment links and create a link. See payment links.

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Open the link in another browser or window. This is what your buyer sees.

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Pay it with a mainnet wallet.

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Back in the dashboard, open Payments and find it. The status moves to SUCCESS when you are credited. Statuses are explained in payment statuses.

Check settlement
Open Settlement. In flight shows money on the way; Settled shows what landed; Fees taken shows what was deducted. See settlement.
Go live
Repeat the setup on https://dashboard.mayarin.xyz, switching any API key and base URL together. A testnet key does not work on mainnet.