Invalid Digest when paying with installments
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The plugin does not correctly compute the security digest when installments are selected. The reason is that the Alpha Bank e-commerce API requires a specific order for the variables when calculating the digest. Specifically, extInstallmentoffset and extInstallmentperiod should be placed after trType but before confirmUrl. In the current version (2.0.4) of the plugin the 2 optional variables extInstallmentoffset and extInstallmentperiod are placed at the end of the buffer, thus making the digest incompatible with the API.
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The solution is to add the following 2 lines of code in the file classes/WC_AlphaBank_Gateway_Base.php:
'extInstallmentoffset' => null,
'extInstallmentperiod' => null,just after the line
'trType' => $trType,and just before the line'confirmUrl' => get_site_url() . "/?wc-api=WC_alphabank_Gateway&result=success",.
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