Central Board of Secondary Education
CBSE (http://www.cbse.nic.in/) is issuing marksheets, passing certificates, migration certificates etc. through DigiLocker. These are either pushed, or can be pulled by students into their DigiLocker accounts. Currently available - 2004 - 2020 [Class XII], 2004 - 2020 [Class X], 2017 (NEET Rank Letter & Marksheet), 2016 (NEET Rank Letter), 2018 December (CTET Eligibility Certificate & Marksheet).
https://apisetu.gov.in/cbse/v3Endpoints
16 endpoints available
/hpcer/certificateClass XII Passing Certificate
/hscer/certificateClass XII Marksheet
/hsmgr/certificateClass XII Migration Certificate
/nchsc/certificateNCHMCT Skill Certificate (X)
/nctsc/certificateNCHMCT Skill Certificate (XII)
/nsesc/certificateNSE Skill Certificate (X)
/nstsc/certificateNSE Skill Certificate (XII)
/ntltr/certificateNEET Rank Letter
/ntmks/certificateNEET Marksheet
/skhsc/certificateSkill Certificate (X)
/sktsc/certificateSkill Certificate (XII)
/spcer/certificateClass X Passing Certificate
/sscer/certificateClass X Marksheet
/ssmgr/certificateClass X Migration Certificate
/tetcr/certificateTeachers Eligibility Test Certificate
/tetms/certificateTeachers Eligibility Test Mark Sheet