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Using integrated address method without any argument while calling, it gives me response of 16 bit longer string of payment ID covered with <>.

According to documentation of wallet RPC for transfer method it requires 64 characters hex string to pass in Payment ID.

I have 16 character string and I want 64 character strings, in this case what should I do?

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First, integrated addresses embed an 8 byte (64 bit, 16 hex chars), payment ID. Monero started with an older format of payment ID which allowed for 32 bytes, but this was deprecated in favor of shorter 8 byte encrypted payment IDs, as used by integrated addresses.

Second, when using the RPC method transfer, if you are transferring to an integrated address, you would not supply the optional parameter payment_id as this is already set in the integrated address.

I have 16 character string and I want 64 character strings, in this case what should I do?

I strongly recommend against this. Payment IDs in general are being deprecated in favor of subaddresses. If you must use a payment ID right now, use the short payment IDs (e.g. the type embedded in integrated addresses), therefore limited to 8 bytes. There really is no good reason for any new implementations to use payment IDs.

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  • Thank you for simple explanation about payment ID, is integrated address is deprecated in current implementation of wallet_RPC method?
    – Rudrika
    Commented Jul 29, 2019 at 14:11
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    "is integrated address is deprecated in current implementation of wallet_RPC method?" <- you can still use integrated addresses at the moment, but advice is to use subaddresses instead.
    – jtgrassie
    Commented Jul 29, 2019 at 16:23

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