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Pi.createPayment({ // Amount of π to be paid: amount: 3.14, // An explanation of the payment - will be shown to the user: memo: "...", // e.g: "Digital kitten #1234", // An arbitrary developer-provided metadata object - for your own usage: metadata: { /* ... */ }, // e.g: { kittenId: 1234 } }, { // Callbacks you need to implement - read more about those in the detailed docs linked below: onReadyForServerApproval: function(paymentId) { /* ... */ }, onReadyForServerCompletion: function(paymentId, txid) { /* ... */ }, onCancel: function(paymentId) { /* ... */ }, onError: function(error, payment) { /* ... */ }, });