how to sign PSBT using HD wallet

[Taha-daboussi]

Hi , am trying to Sign a PSBT that was give from a specific site to complete the purchase process ,
only thing that I was able to do Is to debug the website code to find how they generate the unsigned base64 and convert it to the Hex version .

while still lacking the knowledge to Sign the PSBT to be able to complete the purchase process and example PSBT :

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