Como converter um pacote em crédito e usar o saldo

Para converter um pacote em crédito:

https://lh7-rt.googleusercontent.com/docsz/AD_4nXfBiyEM-H4mcQxWZ-i7yjcexACJj8v_wXB7TLLhC4USXbkdkoCIhZtb9c_68jOe63KliRR1LWY7aICLS2OpwdO-LY2ikLkh7ZQUwnvrg6ah8HSL0jltYU7RDxz4R9xXSYJDAsn_7jPimrXlYxJ_sAr3pVk0?key=Oi9sx4dtv41gsZSLC0yzNA

https://lh7-rt.googleusercontent.com/docsz/AD_4nXeTAkb1Zn__70KHMH1B36ctZkoie7H8gVfklEWS4I1Zu4gonLfF3qrTqGtbujTQqMBrRxHVqQ801li1-MQ4j-9uO__rPwPb7TYQHTm2Ndr0pQerCiIvoACt1pjCYf1m8R0rb--fR-kcllJLKqAya2xbyK4m?key=Oi9sx4dtv41gsZSLC0yzNA

https://lh7-rt.googleusercontent.com/docsz/AD_4nXecKWz9yN---nHQ6glcreu1I_uHHiZaY28i_45LGcqi3y4UzFK7FFa_kIispSrNs9ujfqAEJvyQxx-UbaiQzVvt4nGMNxP2-RRVklS_DCm8HJl1iZhwKMrO3fD8gmYTEB_2QvDvQcBCY9iP2NSg_nxeL0TT?key=Oi9sx4dtv41gsZSLC0yzNA

https://lh7-rt.googleusercontent.com/docsz/AD_4nXe7HflFvopfjGU2V5Wq77IYNHz-JuMelebuVG6lzo4Q51-iVrc-nFYrgKQ8pMkTOuzHU8TRaPlsy9vWrBhu7V3NcsP8UVOrZ-PgAmg0xxuHgfORMp0b8P9nhRlvWEG-tAmBfMj3SN14DL0IyFekrCtpTxMm?key=Oi9sx4dtv41gsZSLC0yzNA