g2apy configuration G2APAY installed, confiured but still not available for payment

[apssol 0]

Hi people, I installed, configured and enabled G2APAY but I still cannot enable it in payment options. I tried changing main region, legal currency, etc. without any result. Can anybody help me on that? thanks!
Hola gente, he instalado G2APAY pero no logro hacerlo funcionar. Lo veo habilitado en la seccion modulos pero al momento the pagar, únicamente aparece, "trasnferencia" ó "cheque". Agradeceré vuesrta ayuda. Gracias!