Issue with Payment Gateway Integration in Phoca Cart

[sulpher]

Hello,
What payment method you are mentioning about and who is developer of the plugin?
You mentioned about errors encountered during the checkout - please provide more information - full description of the error/screenshot.
Also please make sure the version of the payment plugin you've using is compatible with Phoca Cart installed on your site. Perhaps there is an obsolete version of the plugin which is incompatible with existing Phoca Cart version.
More details are needed.