generate pymt from multisig wallet, lifted from https://github.com/blockcypher/blockcypher-python/issues/28

multisigtxcreator1.py

from blockcypher import create_unsigned_tx

dest_addr = "mgMZ3UdQsEmJ1ebjRV9ibTn1DFCxgmMo7a"

priv1 = "9c46389dde9e820294b68defd44e01da12cfe1374324cf27c198e4822e7d9d1e"
pub1 = "0471b0e83960b9a8ad980400fc7ee85e9739009f0ee08ef033784bdcefe7f38c64e9ba2b9d842089486735556e0b1940304db510ad521865bb5b028dee229c1dbd"
addr1 = "mySFV5esqFZqz8maEVjEodxwc9xyhXMmmY"

pub2 = '04a3cc3225df2ef6ca72e960c5cab0059731301d5efe61e7ffa1c4cac3a8e4994adcb27f01a282b7747d96ffdad324e774087c4a35197e99016bca62541af26eab'
addr2 = 'mouKAz9iAgMJzZjiiw4bZ4rxkJapkTXVDZ'

pub3 = '04db43666cf4206e7848aaaf551e2ea6af2488b23046c155f1456d0dd175c782eef61acc42ededcd45a37012c7e096125e356c839e9c0a5f9c75d48aeddcad6712'
addr3 = 'mkmCeTJCLuhQw37xGCW7gFSSh3z4wXxGQ1'

pubkey_list = [pub1, pub2, pub3]
#multisig = generate_multisig_address(pubkey_list, coin_symbol='btc-testnet')
# so we got:
multisig_addr = '2NEMZM6bLwdT18sKSrnfXcdcdGfqgccc9Qj'

inputs = [{'pubkeys':pubkey_list, 'script_type': 'multisig-2-of-3'}]
outputs = [{'address': dest_addr, 'value':200000 }]

unsigned_tx = create_unsigned_tx(inputs=inputs, outputs=outputs, coin_symbol='btc-testnet', include_tosigntx=True, api_key='8ef9f4d633d54aa891f583e1bdf2b9a7')

import pprint; pprint.pprint(unsigned_tx, width=1)