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Metamask: Js callback ignored after Metamask Pay confirmation – if multiple payments are shown in a popup
When paying via MetaMask, a situation may arise where there are multiple unconfirmed payments. The problem is that in this case, when one of the transactions is completed, the js callback is ignored.
The problem is that the MetaMask “payment” function processes multiple payment requests and clears its internal state as soon as the transaction is resolved. However, it does not notify the JavaScript callback function (in this case “onComplete”) about successful payments made using this function. This means that even if you have successfully paid via MetaMask and are prompted to confirm the transaction in a popup, the js callback will be ignored.
This can be confusing for users trying to verify their transactions or recover lost funds. In such cases, it may not be immediately clear why some payments were approved and others were not.
To address this issue, developers should consider using alternative approaches, such as using Web3 libraries such as Web3.js or ethers.js, which are a more robust and reliable way to handle MetaMask transactions. These libraries often have built-in functionality to handle multiple payment requests and report successful payments using a js callback.
It is also worth noting that some browsers may behave differently when it comes to approving payments. For example, older versions of Chrome may continue to display a prompt after a transaction has been approved even if the js callback has not been reported. This can make it difficult for users to understand why their transactions are being processed.
To address this issue and ensure that your MetaMask-based application is functioning properly, developers should monitor their logs and browser console for errors or warnings related to payment processing. They may also consider implementing additional checks or fallback mechanisms in case the payment validation using the js callback fails.
By understanding the limitations of the “payment” feature and taking steps to work around them, developers can create more robust and reliable applications that meet the needs of their users.
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