The following fields are able to called onto signup pages and written to: 

Names

First Name with {{ signup.first_name }}

Middle Name with {{ signup.middle_name }}

Last Name (or Organization Name) with {{ signup.last_name }}

Full Name (does not auto-fill, parses into first+last fields) with {{ signup.name }}

IDs

Email with {{ signup.email }}

Send me email updates with {{ signup.email_opt_in }}

External ID with {{ signup.external id }}

Profile Info

Don't publish my profile on the website with {{ signup.is_profile_private }}

Username with {{ signup.username }}

Short bio with {{ signup.bio }}

Website with {{ signup.website }}

Profile image with {{ signup.profile_image }}

Headline for your profile {{ signup.profile_headline }}

Profile Content

Don't publish my survey question answers on the website with {{ signup.is_survey_question_private }}

Allow search engines to find my profile with {{ signup.is_profile_searchable }}

Include me in leaderboards with {{ signup.donations_to_raise_amount }} 

Employer with {{ signup.employer }}

Occupation with {{ signup.occupation }}

Ethnicity with {{ signup.ethnicity }}

Religion with {{ signup.religion }}

Place of Worship with {{ signup.church }}

Birth Date with {{ signup.born_at_chronic }}

Availability with {{ signup.availability }}

Note (background) with {{ signup.background }}

Sex with {{ signup.sex }}

Phone Numbers

Phone with {{ signup.phone_number }}

Work Phone with {{ signup.work_phone_number }}

Mobile phone with {{ signup.mobile_number }}

Mobile opt in with {{ signup.mobile_opt_in }}

Submitted Address

Address (Street, City, State, Postal code) with {{ signup.submitted_address }}

Country (drop down) with {{ signup.country_code }}

Home Address

Address Line 1 with {{ signup.home_address.address1 }}

Address Line 2 with {{ signup.home_address.address2 }}

County with {{ signup.home_address.county }}

City with {{ signup.home_address.city }}

State with {{ signup.home_address.state }}

Zip with {{ signup.home_address.zip }}

Country Code (e.g. US, CA, FR) with {{ signup.home_address.country_code }}

Mailing Address

Address Line 1 with {{ signup.mailing_address.address1 }}

Address Line 2 with {{ signup.mailing_address.address2 }}

City with {{ signup.mailing_address.city }}

State with {{ signup.mailing_address.state }}

Zip with {{ signup.mailing_address.zip }}

Country Code (e.g. US, CA, FR) with {{ signup.mailing_address.country_code }}

Billing Address

Address Line 1 with {{ signup.billing_address.address1 }}

Address Line 2 with {{ signup.billing_address.address2 }}

City with {{ signup.mailing_address.city }}

State with {{ signup.mailing_address.state }}

Zip with {{ signup.mailing_address.zip }}

Country Code (e.g. US, CA, FR) with {{ signup.mailing_address.country_code }}

Work Address

Address Line 1 with {{ signup.work_address.address1 }}

Address Line 2 with {{ signup.work_address.address2 }}

City with {{ signup.work_address.city }}

State with {{ signup.work_address.state }}

Zip with {{ signup.work_address.zip }}

Country Code (e.g. US, CA, FR) with {{ signup.work_address.country_code }}