Any form the builders accept: base64 routeXdr, 0x hex, raw bytes, { routeXdr } / { swapXdr } / { bytes }, or a decoded payload object (encoded locally first, so the check covers exactly what would be signed).
routeXdr
0x
{ routeXdr }
{ swapXdr }
{ bytes }
Any form the builders accept: base64
routeXdr,0xhex, raw bytes,{ routeXdr }/{ swapXdr }/{ bytes }, or a decoded payload object (encoded locally first, so the check covers exactly what would be signed).